If you cannot find more recent UK-customer experience postings on here, you might want to try the HOTAS/HOSAS discord and/or VKB's official Discord server. I'm sure there are UK customers around on either of the two who could share their experience with you.
From what I remember reading from UK-guys:
You pay VKB's price excl. tax and then you'll have to pay UK VAT/import duties later on (this last step has nothing to do with VKB) - usually this is handled by the courier who will probably also charge you an extra "handling fee" on top for taking care of all that stuff for you.
When I ordered my Delanclip set from the UK about 10 months ago, that's how it went for me. Paid their price (around GBP 60 IIRC) and when my package arrived, DHL charged me another €20 at my door for import duties and handling fee. All in all, GBP 60 turned into roughly €100 for me (can't remember the GBP to EUR exchange rate

) - so do expect a non-trivial amount in fees and taxes added. Granted: This was an order going the opposite way (UK to EU), but AFAIK it's pretty much the same thing for you guys over there when ordering from the EU.
S.