It seems that Wirex is gonna use Contis Financial Services LTD to as the card issuer.

"Your Visa Debit & Prepaid Card will be issued by Contis Financial Services Ltd who is authorised by the Financial Conduct Authority to issue e-money (Firm Reference Number: 900025) and is a member of Visa. Please note the Visa card is an electronic money product and although it is a product regulated by the Financial Conduct Authority, it is not covered by the Financial Services Compensation Scheme. We ensure that any funds received by you are held in a segregated account so that in the unlikely event that Contis Financial Services Ltd becomes insolvent your funds will be protected against claims made by creditors."

I think it will be great and I can't wait to get my hands on the card. I'm really keen to see the limits.