I recently transferred my cash ISA from Abbey to Intelligent Finance.
I noticed the date that Intelligent Finance opened my new account was 5 days after the date that Abbey closed my old account. Therefore my money was sitting in Abbey's coffers for 5 days earning interest for Abbey before my money was credited to my new account with Intelligent Finance.
I have spoken to Abbey about this who explained that when someone transfers a cash ISA to Abbey, Abbey sets the account opening date and backdates interest accrual to the same date that the account was closed with the previous financial institution, so that the customer does not lose any interest. Abbey says that this is standard industry practice and so they think Intelligent Finance should have done likewise. Intelligent Finance says that it only received my money from Abbey on day 5 and so will only accrue interest from that date.
Even though the amount of interest is relatively small, out of principle I am determined not to let either bank get away with defrauding me of my interest. Abbey have earned interest on my money and Intelligent Finance have not followed standard industry practice. Each bank is effectively blaming the other. What should I do about this?