Wasn't there the thing that if you add a savers a couple of times then it will fail, but after that they allow you to upload a bank statement? or something like that
Most folk preferred using savers at the time as they were 10x easier to open than current accounts. A lot of banks allow savings accounts to be opened (and closed) instantly via their apps. There's also no credit checks involved when opening a savings account.
I could open 30+ savings accounts this morning and nobody would bother. I very much doubt I could do that with current accounts. It would take a lot longer to get that amount opened.
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