In reply to nickinscottishmountains:
Agreed those things are a bit heavy, but if you anticipate baling out from well documented British rock, requiring multiple abseils and abandoning gear, may I be as bold as to suggest that you look somewhere else for routes with a level of difficulty / seriousness that reflects your ability. If you genuinely get in to trouble and have to leave some gear to escape safely, so what! Abandoning gear is a damn sight cheaper that a life.
There was a time, not many years ago when I would regularly carry home made pegs, sacrificial polypropylene slings, and cheap shackles purchased from a hardware store, for baling our from places we decided it was better not to be, or from the tops of routes where an abseil descent was preferable to a long walk over loose and unstable ground.
This was, however, in the UAE, where we were developing new routes and new crags, and where dangerously loose rock ahead often forced a hasty retreat from our chosen line. (There were also no gear shops, so conservation of one's rack was imperative.)