45 banks and payment providers are in the system: https://www.wearepay.uk/participants-list/ https://www.wearepay.uk/participants-list/ Most, if not all, of th

45 banks and payment providers are in the system: https://www.wearepay.uk/participants-list/ https://www.wearepay.uk/participants-list/ Most, if not all, of the rest (such as smaller building societies) will take part indirectly through an account with one of the participants.