So got a quote for a whole new clutch from VW as a worst case scenario....
Listers Stratford upon Avon wanted £1600 for a new clutch and flywheel!!! Ridiculous, they said they wouldn't charge any extra for labour of the flywheel, but the flywheel was nearly £600 and they couldn't even tell me the manufacturer who produced it!!! Its less than half that on ECP for a Sachs one. Think I'll be trying to source a local garage to have a look.
£120p/h just to investigate, no thanks!
Quote of the phone call "well, the GTI flywheel is very expensive" pretty sure its the same spec as my old tdi! Safe to say I wont be going there.
I Think its the slave cylinder though, still a fair few hours labour non the less!
Thanks for the insight though Xjay, much appreciated.