I spoke to Securatot a couple of days ago who swore blind that the best seat for my Fiesta would be the Besafe Izi, and that it's the smallest and the TWE, which is the next size up, requires 8cm more space (taken from the passenger seat).
I just spoke to the Milton Keynes folk, who said without hesitation that the TWE would be the best, and when I asked about the Besafe laughed out loud and said it was a monster seat and would be problematic in a Fiesta.
I know the obvious answer is keep DS in his Cabrio for as long as possible and then trek to one of the shops to try them out, but I'm still a bit baffled about how I've ended up with such contradictory advice.
People on my original thread all mentioned the TWE, so I think MK people are right. Why would Securatot be so off the mark?