[Ringoosmeg]

There had used to be several at the Austin-Rover works at Longbridge, Blue circle has several at its plant near Dunbar, mind most of those at Dunbar will never run again..
There were also loads at various power stations and coal pits.

A lot of the aggregate companies still use them, although some are of the later non sentinel versions, remember that the last version of the design were made by Tomas Hill of Rotherham.

An the MOD has used them a lot, but for obvious reasons these are seldom seen and photgraphed.

trust this of help.