Yeah i think i'll have to replace mine before that happens. Loving the pic in your sig btw mate Quality!!!
So will any Mk3 GTI alternator fit onto mine then? Also, are there any others i should look for which will bolt straight on. Maybe a 16v one or something?
mk3 stuff will fit but you need everything off a mk3 to fit it, crank & waterpump pulleys, alt bracket , pas pump, brackets and pulley if you have pas etc.
sounds like the belt slipping to me, if it was the bearings you'd know it and it wouldn't go away. Try some belt dressing on it, screw fix might do it if not RS do http://www.bearingboys.co.uk/Ambersil_Belt_Dressing-18448-p?shopping
if your going to replace it if you need to, try spraying some wd40 in towards the bearing with the engine running, itll get drawn in and stop the sqeel, atleast for a momnt and youll hear the sound change if its that, if not spray the belt, itll slip even more but the noise will go away, degrease everything if it does.