Starting to check out the discounts available - my ideal specification is £39,920 OTR according to the VW configurator (trying to keep it under 40k)
You do know that the £40k is based on 'list price' not 'OTR price'?
The £40k 'list price' limit is the RRP, VAT, delivery charges and pre-delivery inspection charges. It doesn't include the first registration fee or the cost of first VED. So on the Clubsport you have an extra £595 to play with. 
I didn’t know that, thank you 
You're welcome. For something dealers could be making more money on, I'm very surprised more explanation isn't given/known. This isn't just VW, in my experience you could ask most salesman and they wouldn't know off the top of their head, they'd have to look it up. It's also not explained on the VED GOv website, nor in any of the literature/brochures.
Just think of all those extra £595's they are losing and missing out on.
