[robhu]

True, but there are only four 'big banks' Barclays, HSBC;, Lloyds Banking Group, and The Royal Bank of Scotland Group.

100% coverage might be quite time consuming, but getting most the market is not going to be excessively hard.

[steingrd]

Perhaps four in UK, but PSD2 covers the rest of EU/EEC as well :) That's a lot of integrations...