Whilst Looking for Info on Lt Col Chaundler's drop I found the following site:
Gavin's Paratroopers
You have to use the Google cached version, as the live site has run out of band width!!
It purports to list and detail every Parachute drop that has been made by any
army, and it has some very detailed information.
It does mention Chaundler's drop off into water, as well as the kit that was dropped with him. It does not, however mention the RAF Regt going into Sierra Leone!
Well worth taking a few minutes to read it.