The River Thames (Hungerford Footbridges) Order 1999

7.  The undertaker shall repay to Railtrack PLC all reasonable fees, costs, charges and expenses reasonably incurred by Railtrack—

(a) in respect of the employment of any inspectors, signalmen, watchmen and other persons whom it is reasonably necessary to appoint for inspecting, watching, lighting and signalling railway property in order to prevent as far as is possible all interference, obstruction, danger or accident arising from works for the maintenance of or the failure of the authorised works,

(b) resulting from any speed restrictions which may, in the opinion of the engineer, be required to be imposed as a result of the construction, maintenance or failure of the authorised works, or from the substitution, suspension or diversion of railway services which the engineer considers may be necessary for the same reason,

(c) in respect of any additional temporary lighting of railway property in the vicinity of the authorised works, made reasonably necessary as a result of the authorised works or the failure of those works.