Thanks everybody for the responses. I think I'm going to go with this one: http://www.rule-industries.com/prodI...E&typeId=RATBP
It seems that most problems stem from the float switch jamming open, so if I can avoid this by going with the computerised version then it seems like a good idea. I really wish I could fit an extra battery but I just don't have the space. The transom well is generally kept very clean and I have never jammed the manual rule bilge pump that I have so I guess the auto one should be the fine there. I'll just have to check for any large debris before I leave the boat in future!
Mike, is this the version you have http://www.rule-industries.com/prodI...&typeId=RATBP?
and did Barnet fit it? (I'm getting mine from them too)