London Local Authorities Act 1996

8 (1) Where a penalty charge notice or enforcement notice is served on any person and the penalty charge to which it relates is not paid before the end of the relevant period, the council serving the notice may serve on that person a statement (in this paragraph referred to as a “charge certificate”) to the effect that the penalty charge in question is increased by 50 per cent.

(2) The relevant period, in relation to a penalty charge notice, is the period of 28 days beginning—

(a) where representations are made under paragraph 2 above and a notice of rejection is served by the borough council and no appeal against the notice of rejection is made, with the date on which the notice of rejection is served; or

(b) where there has been an unsuccessful appeal against a notice of rejection, with the date on which notice of the adjudicator’s decision is served on the appellant.

(3) The relevant period, in relation to an enforcement notice is the period of 28 days beginning—

(a) where no representations are made under paragraph 2 above, with the date on which the enforcement notice is served;

(b) where such representations are made and a notice of rejection is served by the council concerned and no appeal against the notice of rejection is made with the date on which the notice of rejection is served; or

(c) where there has been an unsuccessful appeal against a notice of rejection, with the date on which notice of the adjudicator’s decision is served on the appellant.

(4) Where an appeal against a notice of rejection is made but is withdrawn before the decision of the adjudicator is made the relevant period in relation to an enforcement notice is the period of 14 days beginning with the date on which the appeal is withdrawn.