So after getting lots of helpful advice on here, I had thought I was going to go for a BJCM double, but then I wondered if I would get away with selling my Maclaren and buying a second hand BJCM single and fitting a buggy board. Was all enthusiastic about this plan until I realised that you can't use a buggy board with it with the carry cot attached 
I was in John Lewis and it seemed like all the Baby Jogger type buggies have this issue - or there any that don't?
Anyone have a recommendation for something that would work with a buggy board? It would mostly be for nipping around town - lightweight and easy and compact fold are priorities, but also I like the BJCM GT because I could take it more off road on occasion.