Conker I'll remember that!!! Always double check and get a second opinion from conker's posts LOL!

The belt is brand new as it was replaced at the same time as the pulley...and the pump as I said originally. Belt was okayish to begin with and as its gone on its getting worse...
I presume by deflection we are talking tension? The pretensioning screw doesn't have much left to go tho?!

so unsure how to tighten it up further...proper belt as well as the first one was a bloody fan belt so checked the VW parts code and got another!
Anything other than that guys?