Basically, I believe I found a loophole but I'm too afraid to ask the bank if it works, and I can't find any info about it.
So with the FlexStudent account, you get access to an arranged overdraft that increases per year up to year 3. To keep the account, you would need to pay in £500- not keep, just in. It doesn't have to be in one go and it still works if I'm in the minus (within arranged overdraft).
I wonder if I send £500 from the overdraft (from a balance of £0 to -£500) to another bank/account, and then send it back to nationwide, would you qualify for the mandatory £500 pay in requirement?
I'm not sure how to test it myself because I only thought of this after adding £500 in anyways, so I can't exactly test it.