If you have a Britax Dualfix 360...

[HerculesMulligan]

....when did you turn it around to be forward facing? My DS is 2y4m and very long, and his legs are already halfway up the back seat.

I haven't yet and my DD is 3 and 104cms tall with long legs.

Does he seem comfortable, Izzy? And (different question) how close to the top of the back is his head?

DD1 has just turned 4 and is still RF in hers. Her sister will go into it in the next month and we'll buy a new ERF for DD1. She's average height and perfectly comfortable. She has only ever rear faced so doesn't know the difference

She is really comfortable. Her head isn't poking over the top yet.