I'll post this post script....
Firstly thanks for all the suggestions.
I preiodically get pancreatitis/gall stones...don't eat for upwards of 2 weeks, lose weight and fitness and then spend weeks gaining weight and fitness back.
Looking at all the suggestions, I really can't see me and my wife (and luggage) getting on with a bike noticeably lighter than the 250kg ish AT we now have. I'm going to keep it for the time being. When/if I'm ill again, if it is mid winter it won't be an issue. If it's mid summer, I may have to revisit what we use a bike for and look at fly-ride rather than riding a 300kg bike and kit across Europe. Hope that makes sense?
(Buying an e-road bike off here really got me back to fitness in a great way...highly recommended)