My knowledge of lighting regs really ends at fitting Xenons where a self-levelling system is not installed, and of course the uber-bright 'off road use only' halogen headlamps etc which will cause accidents by blinding oncoming traffic, in the same way the aforementioned non self-levelling lights do. And of course blue lights are illegal unless on an emergency vehicle or on private land.
Managed to find a spare bulb last night, so at least I've got both brake lights on (96 car = not fitted with LED centre brake light, it's on the retro-fit list.)
Worried it might be a 'trial and error' thing ie: but some bulbs, if they melt my rear clusters, then go for the next ones down - and replace rear cluster. Or, buy some, if they are Chinese pants (and sadly seems the philips stuff has also had some bad press about short lifespan) and they fail after a few months, then buy some more. It's going to get expensive given I've neber bought a lightbulb in my life! (that's what scrapyards are for
)
Really appreciate the feedback so far, please keep it coming!