I am currently using the maxi cosi cabriofix with my trusty phil & teds sport with the adaptor for my 6 week old 4th child. However, tbh it's rarely used as a double as my 2yo wants to walk. I find lugging the buggy frame out of boot, then clipping on adaptor a huge faff x3 a day for school and nursery runs. Also, i really find the p & t's difficult to push at times, particularly with one hand.. the front wheel gets 'stuck' in one direction. So I will keep double but want a new single buggy that will take my car seat and be super fast to put up, very light and easy to push with one hand.. suggestions gratefully received..