Even though i worked in a bank many years ago I am a bit confused with the term "available funds" which says that these funds can be withdrawn. However their website goes on to say that depending on your account "Available funds" may also include items which have not yet been cleared and items that may be returned unpaid later. In such an event if a person did not have a limit or funds to cover such items they may well incur surcharge interest in addition to normal overdraft interest which i think may total 27%. I would have thought that "available funds" (which i assume is the same expression as "cleared funds" used in the past) would reflect the timescale taken to clear cheques drawn on banks in this country.