Doesn't seem to accept Visa at the moment. As much as I like the idea (despite the name) of a European Square, not accepting Visa is less than optimal, especially as they try to gain traction.
I read that. Hence why I said at the moment. It'd be great for them to get it sooner rather than later. At least in the UK, most basic accounts issue Visa debit cards and a lot of the basic credit cards are also Visa.
They support VISA in Sweden, so I guess they just lack an agreement with suitable banks and payment processors in the UK.