Found this to be alternator.

Bought a brand new one, off ebay, for 59 pound delivered with a 2 year warrenty. After a quick change of pully on it went. Battery light now ignites when ignition is on and extingushes as soon as engine is started.

No need to rev it past a certian rpm or anything. Seeing 14.2v at the battery now.

Thanks for all the help guys.