I visited Warhammer World to pickup one of the command tank sets. To confirm it is £75 and I noticed the store had loads of them on the shelves and in the windows, more than any other kit.
I also had chance to have a flick through the Warhammer World exclusive campaign book. It might only be £12 but it isn't worth it. Excluding the half-dozen formations and two pages of fluff the rest is all full-page photos of the Ultramarines Vs Chaos diorama that they just put up in the exhibition area. It felt like I was looking at a thinner Warhammer Visions at double the cost. In short, I wouldn't recommend it.
I like how they've seperated the stores into Games Workshop, Forgeworld, and Black Library and the presentation of the place has improved. On the downside, Bugman's Bar is still a rip-off. They wanted £3.50 for a pint of Becks, ended up popping into a decent pub on the way home instead.