As Steve 2006 says the worst part of this job is getting to it.
When I did the usual starter contact replacement job [starter off] it was a bit easier to get to, but be sure you have a good assortment of tools
Longer than normal spanners were a help.
Lucky for me [touch wood] mine was OK.
Engine is different has more power, gear lever layout is different, don't know if the gearbox itself is different.
Series one engine is not damaged if the timing belt breaks, series 2 is damaged.......
I used Blueprint discs and OEM pads, never had any problem.
I think a lot of the wobble and similar problems is more likely calipers that need
a good clean and checking for partial seizure.
Also when fitting discs the hub must be perfectly clean to ensure the disc
runs true.
When you tested the alternator, did you test it under load?
Needs heated rear screen or headlights etc., on to confirm alternator
still puts out more than 12 volts.
You may have to raise the revs a little on this test
Get a new battery before you pay out for the starter.
Sounds to me like battery problems all the time, starter may be OK
The battery on my series two LS is a 2008 YUASA, still perfectly OK
More likely to be corrosion on the wheels allowing air to leak out.
Tyre dealer can remove it and seal/paint the surface.
Can't see it being a slow puncture on every tyre!