Hi Trevor - I have seen your BL Plant long before on youtube.
A very nice arrangement with the belt driven Generator and that
special switch. The RPM from the flywheel gets higher than from
the pulley - so you will get up to 4 Volts - I can reach only
about 2,5 Volts - but the Efficiency is not to high - anyway.
Burning Gas to produce heat - to boil water and drive a piston engine
and then a Generator - probably its 1 to 10
I like these british circumstances
Arnold