http://www.legislation.gov.uk/id/ukpga/2004/12/schedule/30/crossheading/amount-of-unauthorised-payment

SCHEDULES

SCHEDULE 30Registered pension schemes: employer loans

Amount of unauthorised payment

Loan ceases to be secured by charge of adequate value

I16

If at any time after a loan is made the loan ceases to be secured by a charge of adequate value, there is an unauthorised payment equal to amount 2 (see paragraph 13).