Tiger Toilet & Vented Immersion Suits
Remember both well.
Do not know of a crew member who used the toilet but certainly had 1 or 2 passengers use it. Did not last long as the clients realised it was replacing some useful payload (some 40 - 50 lbs I think), and its removal then allowed us to get 19 pax to the NW Hutton with the fresh milk & newspapers on their 1st morning flight. Sadly both the toilet, 19 pax in the back of a Tiger, and the NW Hutton are all just great memories now!
I was one of the crews taking part in the vented immersion suit trial. As John has already posted you ended up as a Michelin man with 2 very full inflated legs (air went in through a garden hose type connector just above the waist), and as well as the 2 shoulder release valves you had wrist cuffs which were left open with a pull cord and velcro tie should you ever ditch. However their worst design flaw was the material used as we had to swim around Stonehaven harbour during the trial, and my suit completely flooded shortly after jumping in.