Try here
Though I am not sure if it is still 819 or part of an HQ Squadron.
HMS Gannet SAR
HMS Gannet SAR Flight
Based at Prestwick airport in Southwest Scotland, it provides 24-hour military and civilian search and rescue across a large area of Scotland, Northern England and Northern Ireland. The flight operates 2 Sea King Mk 5 helicopters and consists of 16 officers, 55 ratings and 32 civilian staff. Tasking is varied and ranges from recovering fallen climbers in winter snow to rescuing injured fishermen up to 200 miles offshore. Additionally, Gannet SAR provides an important medical evacuation service to the many island communities on Scotland's West coast.