Pramsgalore4, thanks for the advice. I will phone boots customer service tomorrow.
I think I would like to keep the swift really rather than sell. It's pretty neat for on trains and travel generally.
I've almost talked myself into a graco from the usa, or a bjcm today, but really the swift would do the job of both with more versatility. Eg, if i go to the nforest the swift will manage a country walk, and fit in the tiny village shops too.