On 22/08/2015 09:45, Charles Hope wrote:

In the 1950 we holidayed a remote village in Scotland where the petrol
arrived on the "steamer" in 50 gal drums. The deposit on the drums was
less taht the cost of sending them back - so they ended up in the sea. The
cost of the petrol had to allow for this. There was a road, but it was
narrow and 3ply. The tanker drivers refused to use it, which is why petrol
(and presumably TVO) had to come by sea.

3ply?