SCHEDULE 1Additional authorised fuels
13
Homefire briquettes, manufactured by Coal Products at Coventry, Warwickshire, which—
a
comprise crushed bituminous coal;
b
were manufactured from the coal by a process involving heat treatment at about 450°C and extrusion;
c
are unmarked hexagonal briquettes and have an average weight of 200 grammes; and
d
have a sulphur content not exceeding 1£5 per cent. of the total weight.