TC, there are about two dozen civvy teams plus police and RAF with 1000 members in Scottish MR. Then there are the following.
Welsh MRT
NI MRT
English MR
ALSAR
Cave Rescue
Auxiliary Coastguard
RNLI
Independent lifeboats
The lifeboat crews generally do not require passenger pre-training in the way that MR and others do. Just because the Aux CG work for the MCA doesn't mean the MCA can remember who they are.