Those are brilliant prices compared to what they cost here in Ireland.....
I paid €100 (inc. VAT) for a Revision D Diverter valve
Over €50 (inc. VAT) for the cam follower and the rubber seal that goes with it (I recommend you get the seal too. And yes, you only need one cam follower)
And €60 (inc. VAT) for the PCV assembly.
That's a total of €210 or £180!!!
Compared to your total of circa £95!!
I'd take their arm off and just be glad you're in the UK where it appears the parts are almost exactly half price
Getting all those bits fitted at the same time as the cambelt and water pump is top drawer preventive maintenance and should set the car up lovely! Enjoy
(Note to self; must start ordering parts from Volswagen Northern Ireland
)