London Government Act 1963

19 If any person—

(a) removes, demolishes or otherwise interferes with any sewer or part of a sewer vested in the Greater London Council or in the council of a London borough or county district, without the previous consent in writing of the council concerned ; or

(b) wilfully damages any sewer, bank, defence, wall, penstock, grating, gully, side entrance, tide valve, flap, work or thing vested in the Greater London Council or in the council of a London borough or county district; or

(c) does anything by reason of which the drainage of the sewerage area of the Greater London Council or any part thereof may be obstructed or damaged,

the council concerned may, without prejudice to any other proceedings which may be taken against that person, recover from him, as a debt due from him to the council, a penalty not exceeding twenty pounds, and also the amount of the expenses incurred by that council in repairing, restoring or reinstating the sewer or other work or thing removed, demolished, interfered with, damaged or obstructed, as the case may be.