Thanks to all that have helped.
We have managed to get word from the police insurers and have confirmed that when I am on a search for any PenMaCRA (peninsular mountain and cave rescue) member or the police I am covered by thier insurance. If I am on a coastguard search that is only MCA I am not. Having said that As long as I advise the police and they agree to task me I am again covered... Golden rule here...make sure I am called out by PenMaCRA or the piice regardless of who the search is for!!
Here endth the lesson!!
happy searching all!
James