Nightjar wrote:

It is currently part of the Maritime and Coastguard Agency, which is
part of the Department for Transport, although it has been handed around
a number of different Ministries and Departments since the Board of
Trade took it over from the Admiralty in 1923. Its origins were as part
of HM Customs. They have had sub-contracted SAR helicopters at four
bases for quite some time now.

The Coastguard Rescue Service, which does cliff, swift water and mud
rescue and searches for missing people is a volunteer body within HM
Coastguard.

Thanks for that.