When I'm shifting up there's the tiniest crunch then all in well. Any suggestions?

Have you tried resetting the gear linkage?

http://www.briskoda.net/forums/topic/237651-resetting-gear-linkageshifter/

Edited 24 May, 201313 yr by booke23

Would change the fluid too!

Makes a massive difference! My old lupo gti had a cruchy box, new fluid and it was sorted

Lets see what happens