Section 242 | Time limits and treatment of financial penalties
From legislation.gov.uk
(1)An assessment of a penalty under section 234 or 235 must be made within the period of 12 months beginning with the day on which the person became liable to the penalty.
(2)An assessment of a penalty under section 238 must be made within the period of 12 months beginning with the day on which the contravention first came to the attention of an officer of Revenue and Customs.
(3)A penalty assessed under section 234, 235 or 238 is due and payable at the end of the period of 30 days beginning with the day on which the notice of assessment of the penalty is issued.
(4)A penalty assessed under section 234, 235 or 238 is, subject to subsection (3), to be treated for all purposes as if it were tax charged in an assessment and due and payable.