Regulation 11 applies to a fixed rate contract if—
the contract has a fixed interest period for part, but not the whole, of the term (whether or not the contract provides for default interest charges); and
the contract is fully prepaid during that fixed interest period; and
the contract requires payments of equal amounts to be made at equal intervals during that fixed interest period; and
all the variables contained in the formula set out in regulation 11 can be determined with reasonable accuracy.