Thanks Peter, that's really useful! I've saved all the images for future ref, for changing bulbs/units
In the end I didn't need to go that far (I discovered, just in time) - the bumper is now off.
There is one set of screws to remove, and two sets of bolts.
* The screws are at the pointed rear edge of the bumper, inside the wheel arch, one each side (same as BA, but far easier to get out as they dont have a plastic sleeve that then breaks off). You will also need to undo the lowest bolt on the wheel arch liner.
* Bolts #1 are underneath, one either side on the underside of the subframe almost level with where the screws are. These are 10mm hex bolts, and they secure the end of a metal bracket on the bumper. Look under the front corner of the car, follow the bumper bracket to the end, and you'll find them.
* Bolts #2 are under the indicator units, two per side. These are chunky 14mm flanged hex bolts (I had to use a 15mm socket for one of them, the head was heavily rusted).
That's it!
[b]TOOLS REQUIRED[/b]
* A metric socket set. In particular you'll need 10mm and 14mm sockets, possibly 11mm and 15mm if the bolt heads are heavily rusted. You won't need any "deep" sockets, but an extension bar or breaker bar might be handy, for leverage on the big 14mm bumper bolts.
* Medium crosshead screwdriver (a stubby is best if you have to put pressure on the indicator unit screw, to get it out). Also for undoing the arch liner screw.
* WD40 or your choice of penetrating spray
* Pliers, 2 sets, to grip and pull apart electrical connectors that haven't been undone since the car left the factory. Plus a soft cloth to cushion the connectors from the pliers, so you don't break the plastic casing if you have to resort to the pliers.
* Possibly a pick set or some small flathead screwdrivers to pry off the metal clip on the back of the indicator unit screw fitting
* Possibly an impact screwdriver to loosen the screws on each side of the bumper
* Possibly your car jacking-up equipment, if you need to get to the back of the indicator unit from underneath. You won't need to remove the front wheels.
* A torch will be handy, essential if you end up underneath the car trying to undo stubborn stuff. A head torch or magnetic torch will be most helpful, as you'll have your hands full.
* Lots of shop roll/cleaning cloths and a soft brush, to clean up penetrating spray and to brush debris out of the light unit wells. Degreaser is also useful (I use "Gunk" degreaser).
* A magnetic tray or any high-sided container to keep the bolts/screws in, that won't tip over/blow over. Don't lose any of the bolts/screws, bag and label them as you take them off!
* Tea. Lots of tea.
[b]STEPS[/b]
[b]1)[/b] Remove the fogs and fog brackets if you have them, and unplug the fogs.
[b]
2)[/b] Remove the indicator units - one long screw in each one (like the BA units), but they may be stuck, as they pass through one of those folded metal clips that Mazda were so fond of. If the clip is rusted (one of mine was), you'll have to jack up the front of the car and access the clip from behind the light unit (partially raise the pop-up light, manually, so you get some daylight in there). There's pretty easy access from below/behind, but you'll have to then fiddle around with WD40/freeze spray/a pick set/small screwdriver to derust the screw and/or clip and pry the screw free of the clip so it releases. It may take a while ... it took me half a day! You will need patience, and you can't do it through the gap between the pop-up headlight and the crossmember. You'll have to do it from underneath/behind (this is why I thought I'd have to take the entire headlight unit out).
The units are connected with one electrical cable, you'll need to undo the connector. If that's difficult and you need more room to get good purchase with pliers to undo the connector, you might want to unclip the squeezy white cable tidies securing the cable behind the light well (see photo), to bring more of it out and give you more to play with.
Below: rear of the offside/UK driver side indicator unit.
[img]https://i.imgur.com/wmbyjEM.jpg[/img]
Below: end-on view of the unit. Note the screw. It won't come out of the light housing (unlike the BA one, which just falls out).
[img]https://i.imgur.com/f5j16cA.jpg[/img]
[img]https://i.imgur.com/hLpgyma.jpg[/img]
Take care not to slip with the screwdriver and scratch the unit's plastic light lens as you repeatedly test with a stubby crosshead from the front, to see if the screw is now free. It's pretty easy to pry from the back and try the screwdriver from the front at the same time, you'll have to reach round with each arm, basically hugging the bumper, but even I managed it. You must have the front end of the car jacked up though, or you won't be able to get underneath to see up into the engine bay, towards the back of the light unit.
Below: After indicator light unit removal (offside/UK driver side) - note light connecting cable, and the two big bumper bolts underneath. Note rusty clip!
[img]https://i.imgur.com/07zOnkH.jpg[/img]
Below: After indicator light unit removal (nearside/UK passenger side) - again, note rusty clip!
[img]https://i.imgur.com/8S4UOHd.jpg[/img]
[b]3)[/b] Remove the set of bumper screws, one screw on each side. These may need an impact screwdriver and a lot of WD40 to get them out safely. Also undo the lowest bolt on the wheel arch liner.
Below: Location of the bumper screw (nearside/UK passenger side), looking up at 45 degree angle towards the pointed end of the bumper. The dark area on the right is the wheel arch liner.
[img]https://i.imgur.com/arRuRoP.jpg[/img]
Below: Bumper screw, one one each rear corner of the bumper.
[img]https://i.imgur.com/JaIAgrA.jpg[/img]
Below: Arch liner bolt fixing point. This is the front of the arch, looking towards the front of the car.
[img]https://i.imgur.com/jOqtQcj.jpg[/img]
[b]
4)[/b] Remove bolts #1 underneath, the ones attached to the metal bumper brackets. Unbolt them at the CAR end, NOT the bumper end, the brackets will then come off with the bumper. Take care, as they are very thin, will probably be corroded and might break. You can ease them off the bumper later and clean them up before the bumper goes back on again. If you've taken off a BA bumper it's a very similar bracket scenario (and the BA brackets get just as rusty).
Below: A very grubby bumper bracket (this one from the nearside). If you take them off the bumper, note which way up / which way round they attach to the bumper.
[img]https://i.imgur.com/gVYrtXq.jpg[/img]
Below: Bolts #1. This view is taken looking back from the front of the car, towards the front nearside wheel. The oblong thing marked with a red dot is the end of the metal bumper bracket. The black thing behind that is the bottom of the loosened arch liner. These are flanged hex bolts with a 10mm head (you might need an 11mm socket if they're badly rusted).
[img]https://i.imgur.com/Wkn3XJ5.jpg[/img]
[img]https://i.imgur.com/991TpfP.jpg[/img]
[b]5)[/b] Remove bolts #2 under the (now removed) indicator light units. Very easy, though they might need an extension bar on your socket for leverage. They will have small white plastic washers on the ends, take care not to lose these.
Below: Bumper flanged hex bolts (14mm head). Note the plastic washers.
[img]https://i.imgur.com/1z9erFr.jpg[/img]
[b]6)[/b] With a careful tug, the bumper should pull straight off. It's much lighter and easier to handle and carry than the BA bumper.
Below: Result!
[img]https://i.imgur.com/1N0lDtT.jpg[/img]
[img]https://i.imgur.com/MJVsWyj.jpg[/img]
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I'll take that info with me.
) 
) After wasting an entire afternoon trying to get it out, I've decided it needs radical action (hammer or pliers) but accessing from below is a pain, so I think I'll have to remove the headlight unit - anyone know how to do this?