"Paul P" wrote in message
...

...Why not get a diesel generator and
run it on old chip fat and vegetable oil - there is no law
about it.

Oh, but there are laws that cover how you obtain such fuel. I
very much doubt that even a large family would generate enough of
its own waste oil to run a generator - so we are into the realms
of collecting waste from commercial users, such as chip shops. In
order to do that legally, in the UK, you need a waste transfer
licence from the Environment Agency. The supplier commits an
offence if they allow you to carry the waste oil without a
licence, and you commit an offence if you take it without said
licence.

--
MatSav