Update, with thanks to all who have contributed.
Lake boots - only seem to be available from Saltdog since the UK importers/distributors went bust.
I tried both types of winter boots (on carpet), but they were just too stiff and clumpy, and chafed at my ankles.
Considering I need them for winter on and off-road and that often includes hike-a-bike, they went back.
Northwave - I was warned they tended to be a bit narrow, so ruled them out.
Shimano - found out they did the MW7 boots in wide fitting as well as standard.
Great. Except they will not sell them in the UK.
e-mail exchanges with Freewheel and Madison (importers) were apologetic but say they do not understand why shimano do this...
So eventually I ordered MW7(MW702) from Singletrack bikes in Kirkcaldy.
My "normal" shoe size is about 39/40. Sizes for boots on shimano website indicated I needed 41, but my very old shimano boots are size 42 and now too small (arthritic toes). So I ordered both sizes 41 and 42.
41 is the best fit I think I will get to include woolie boolie socks and still be able to wiggle my toes. The 42s will be returned.
It is a compromise as the 41s are a bit loose at the heels. This is precisely the problem the wide fitting last was designed to solve - ie rest of boot normal, just wider and higher toe-box. Great if you live in the EU.
First time I have used BOA fastening - so easy to use and because my foot is securely fastened in, it reduces the loose heel problem.
So far only been up and down the road to check cleat positioning etc, but I think they will suit.
They are a lot more robust and warm than my old shimano boots.
Sorry it's a long post, but I was grateful for the chance to read the opinions of others who have posted on YACF.