The Electrically Assisted Pedal Cycles Regulations 1983

4.  The requirements referred to in Regulation 3 above are that the vehicle shall:—

(a) have a kerbside weight not exceeding—

(i) in the case of a bicycle, other than a tandem bicycle, 40 kilograms, and

(ii) in the case of a tandem bicycle and a tricycle, 60 kilograms;

(b) be fitted with pedals by means of which it is capable of being propelled; and

(c) be fitted with no motor other than an electric motor which—

(i) has a continuous rated output which, when installed in the vehicle with the nominal voltage supplied, does not exceed—

(A) in the case of a bicycle, other than a tandem bicycle, 0.2 kilowatts,

(B) in the case of a tandem bicycle and a tricycle, 0.25 kilowatts; and

(ii) cannot propel the vehicle when it is travelling at more than 15 miles per hour.