Hi, we are expecting our first DC are are planning to get a BJCM. I can see that it is possible to get adapters to allow it to take a car seat but it seems difficult to find definitive information on which car seats are compatible.
The most common statement I can find is this:
"Designed to fit several popular car seats including, Peg Perego Primo Viaggio, Britax Companion, Maxi Cosi and most Graco and Evenflo car seat models"
There is also a list here (but on the US site & some don't seem to be available in the UK): BabyJoggerUS
I did search MN but can't seem to find any more detailed information. From what I have read there should be more that would work if not I guess we will just go for a Maxi Cosi.