In message , "Dave Plowman (News)"
writes
In article ,
FWIW, I had a rented flat with an ancient completely non electric central
heating system. All the pipework in iron barrel - and the timeswitch on
the boiler clockwork. It worked very well. Think it dated from the early
'50s.

Clockwork ?

What's that then

You may wish to ignore the throwaway punchline

--
geoff