At least on this side of the pond, the Walkers are quite a bit more expensive than the Chamonix. Both are great cameras, you might also consider the Shen Hao.

I believe that Robert White is the UK distributor.

Any modern 210 will serve, the oft bandied about differences are "but a tempest in a teapot" to quote another Brit. I don't think he shot large format though.

JD