ISTR a Master Green Break Off at Manston of 50ft QFE
I also remember a Decca approach in IMC to Manston at 0200 (post search and the stratus had rolled in) which I broke off at 150ft when this red light appeared in front of and above me. It transpired it was a 300ft cooling tower on the Richborough power station, which was south of Manston, and the Nav was one lane out on his map. Before that I never liked Decca approaches (in the Wessex it was the only thing we had apart from an even worse ADF), afterwards I was even more distrustful.
Sorry, slight thread drift, back to subject. Reading the replies so far would seem to indicate a similar feeling of disquiet for overwater manoeuvering. I have a goodly number of hours over water in both fixed wing and rotary and much as I like to watch displays I think the safety case might need further investigation.