You will remember that you spoke to the offices of Synthax Audio UK about the features of an ADI-2 DAC FS before you made your purchase. You also discussed possibly purchasing a demo unit we had available at the time.
In the end you chose to buy an ADI-2 Pro from DV247.
As you understand, the UK 5 year warranty is a scheme exclusively offered by Synthax Audio UK only when a purchase is made from one of our authorised UK dealers. (https://www.synthax.co.uk/latest/dealers/) Unfortunately, DV247 (being part of a German parent company) is not covered by this scheme.
If you wish to register for the 5 year warranty, you would need to purchase from one of the UK dealers on the list above. You would then also become eligible to use our after sales telephone support services here in the UK.
Synthax Audio UK