I'm sorry but I don't believe such a joint venture would be of any use other than to a small sole trader.
I would certainly not join a bank sponsored accounting system whilst banks treat connectivity (or lack of it) as a "feature", and consider losing log-in for more than a week is worth only £50!
I would also need some sort of assurance that should you wish to change your bank there is still continuity with the accounting system and they don't use is as force majeur to keep you as a customer.
My answers
I'm sorry but I don't believe such a joint venture would be of any use other than to a small sole trader.
I would certainly not join a bank sponsored accounting system whilst banks treat connectivity (or lack of it) as a "feature", and consider losing log-in for more than a week is worth only £50!
I would also need some sort of assurance that should you wish to change your bank there is still continuity with the accounting system and they don't use is as force majeur to keep you as a customer.