<font face="Verdana, Arial, Helvetica" size="2">recommend the use of a clever wedged shaped device with two sharp edges which you slide the line between to cut it , but which in its own right could not be used as an ordinary knife for any other purpose and which could not therefore puncture..</font>
A standard seat belt cutter will do just this. It works on line or webbing. Not familiar with UK market, but DIY auto store should be able to get one.
I echo comments on dunking courses. The main problem after getting in the large life rafts is just how long the weakest stomach holds out. Once the first one vomits, everone else does
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