Scroggs,
plus 100ft to account for man-made obstacles on top of the hill
Tis 300' allowance for uncharted man made bits and bobs lying on top of hills. This is quite important as, from second hand information, there seems to be a number of 280' wind turbines popping up around the country, obviously most likely on top of a hill! So I reckon the MSA is 3800'.
All,
Been posted before, but it is interesting hearing how quickly IMC panic sets in!
http://www.naats.org/docs/flightassist.mp3