On Fri, 09 Oct 2015 09:04:21 +0000, Tim+ wrote:

What is the best and safest way to dispose of the old petrol?

Engine oil tank at your local tip.

You jest surely? Can't see the council tip wanting their waste oil tank
being turned into a potential bomb.

How big is that tank? A litre or two of stale petrol in there is going to
make precisely bugger all difference.

I've taken old petrol down there before, and been told to pour it in
there.