Mark Goodge wrote:

Which banks still offer Solo cards on current accounts? First Direct
have just decided to replace them all with Visa debit, which is less
than helpful as the reason I had a Solo card in the first place was so
that I had at least one card which doesn't require me to sign up for
3D-insecure - switching it to Visa makes it a lot less useful. Any
suggestions as to where I can still get Solo?

Natwest possibly?