Just popped down to my local Argos branch in Oldham and picked one up.
It is actually the Evolva 2-3 Isofit that they have in Argos, which is what the Kidfix was previously called before it was renamed in 2009.
It gets the best score in Which? tests for group 2 -3 car seats.
Saving at least £25 over next best price I could find.