Ok, further update (just to keep this thread updated more than anything else)
DHL passed my 2060S on to the local customs office (the one local to EVGA as the recipient) on October 22nd and stated that they were going to send EVGA a letter requesting documentation to complete delivery, which EVGA told me would happen.
DHL never sent the letter. I emailed them on Thursday October 28th to ask for an update, and the basically said "Oops, letter now on the way" They also supplied info on which office the card was at, along with some other bits of info I passed on to EVGA.
Customs also mentioned that the delivery would only be kept for 2 weeks before being sent back to me, which is this coming Friday. HOPEFULLY it makes it to EVGA before this point.
So after almost 3 weeks it still hasn't got to EVGA. Now I will admit this is my fault for not reading through the EVGA forums and doing my homework on what is required for shipping to EVGA post Brexit...basically using UPS, declaring DDP (delivery duties paid) and including multiple copies of a Pro Forma invoice that can be requested from EVGA.
Just a heads up for anyone else doing the step up. Use UPS, read up on declaring DDP and request copies of the appropriate paperwork from EVGA (all info can be found on their forums)
I may just be unlucky here, but if I hadn't chased DHL then the card would have been sent back to me with additional charges (which may still happen)
To be fair to EVGA they have been great - always responding promptly. Likewise with DHL.