So, we can safely assume that you have more than 25 accounts. Spare a thought for us poor folks.
On the strategy of keeping 25 or more active accounts, so that you do not have to fill out the details of each in the FBAR; I remember that in an earlier thread on this topic, someone observed that you could include your TfL Oyster Card for the purposes of increasing the number of accounts to twenty-five or more. Anyone have other suggestions of prepaid accounts (etc.) that could possibly qualify?
(I realise that if you take advantage of the "25+" rule, you have to make sure you keep good records in case the authorities ask for them later on.)