I don't think Square can come to the UK in their current form. The card reader, although could technically work, will not be allowed by the credit card companies here. Square would need to make a small chip and pin reader for phones, similar to what PayPal have done.
Are confusing Square with Stripe? If so I am in the beta and its brilliant. You can get in the beta by emailing them.
Are confusing Square with Stripe? If so I am in the beta and its brilliant. You can get in the beta by emailing them.