Just to clarify; the British army is doing what it's doing and I have little understanding of the rational behind it so please don't read what I'm writing as a defence of current UK actions. I do however feel that upgunning APCs and expecting them to play some sort of 'tankish' role is both a waste of an APC and most of the men in it and a recipe for getting royally rodded by some real MBTs.
I agree that using an APC as a tank is a bad idea. But I don't agree that having a lightly armed battlefield taxi is going to be very useful anymore either. But one has to be able to bring enough a$$ to properly support the infantry, firepower light tends to result in some bad times.