I'm bound to say that I thought the suggestion of using glideslope indicators as a training device a poor idea, as surely pilots should be taught to operate from any type of runway. At most GA fields the only indicator you get is the numbers and many strips don't even have those, so flying by basic principles rather than using big-aeroplane props seems more sensible to me.
Thanks to Nimbus for sensible advice.
Re approach speeds: you often hear people say "such and such an aeroplane has a tendency to float". I said this to my instructor one day and he replied "no they don't: people have a tendency to fly them 5 or 10 knots too fast into the flare".
Lastly, a pity that these prangs occurred at embattled Rochester and not at secure Biggin where the naughty aeroplanes came from.