tracking the history of G-ALMB helicopter

I didn’t know whether to post it here on in historic aviation really, but being a chopper that we’re talking about many people would have been like “eeewww!” in there, so here goes:

a friend of mine is trying to track down the history of a Sikorsky S-51 helicopter, which was registered in the UK as G-ALMB and was probably used by an oil company. If anybody could provide me with any information or picture about this specific career stage it would be really appreciated!

Cheers

Alex