QFE
There were no casualties when the SRN4 hit the wall, as the 2 seats nearest the impact were vacant, 2 friends of mine having missed it. There were 5 casualties in 1972 when a cross-solent SRN6 overturned in a force 8 gale.
Check out the Hovercraft Museum at
http://www.hover.globalinternet.co.uk
Unfortunately they have a problem with their loctaion at HMS Daedalus as it is due to be reactivated (details of new usage unclear) and they may be forced to move. They also have a general access problem and are onlyopen a few days each year.