A guess would be Aldergrove as I am sure a yellow cab was seen there for a short time and they had a need of SAR cabs for their SAR cover.
Not yellow, but -
Never saw her in yellow livery, but I think this is what you’re looking for. S*** H****d makes a point to P*** M***s as they walk in from RAF Aldergrove dispersal after a SAR practice flight. I think 518 was the first dedicated SAR cab that 72 operated – note additional aerials, etc – but will defer to those who know. The 72 SAR line long pre-dated her arrival, and is still badly missed here as I’ve noted on other posts.