Im due our 4th baby in 10 weeks time and we already have a Phil & Teds Sport which I bought in May for ds3.
I know that P&T dont recommend that you use a car seat whist the pushchair is being used as a double but I have seen people using it with a car seat and its looked fine (Im assume its not recommended because of a tipping hazard?)
Does anyone use it as a double with a car seat? If so which car seat do you use- the Maxi Cosi or the one P&T recommend?
It's only suitable for use with a car seat really for twins where one baby is in the car seat and the other is lying flat in the seat. YOu won't be able to use it as a double with a car seat on it for a toddler and baby. In answer to your question, Maxi cosi adaptors are around about £22 and Maxi Cosi car seats are readily available
My friend used hers as a double with maxi cosi on top and toddler seat on back (with 2.5yr old in), I know you are not supposed to but it did look safe or she wouldnt have used it. I couldnt imagine using it with flat seat...