Special Raiding Wing and SBS: 1950

Gentlemen:

Can anyone tell me the date of the formation of the SBS within the Royal Marines (post war)?

An interviewee of mine, a member of 41 Commando, was trained at the Special Raiding Wing and along with six other members of that unit, joined 41 Commando for operations in Korea.

The training wing was the Special Raiding Wing, but was the unit at that time the Special Raiding Squadron, the Special Boat Section or the Special Boat Squadron?

Thanks in advance for any assistance, links, sources, etc