Though I am in Chicago, I believe the place you want to send your wheel to is Central Wheel in Birmingham. Others here may know people closer to you, but there is no question that these are the "big boys" in classic motorcycle wheels in the UK. I had considered sending mine there, but shipping prohibited.
As for the tins, fender and shrouds, they can all be fixed. My fender was sooooooooo much worse than yours (basically, bent in half) and I returned it to the condition you see at
http://www.a7a10.net/forum/index.php?topic=166.0 . Of course, that was lot of work and exercising a hobbyists knowlege of body work. Perhaps the price of professional metal work would easily overwhelm the price of replacement parts that only need sanding and painting.
I know I'm harping on it, and apologize if I'm telling you things you bluntly know, but the steering head needs a very close look beyond just seeing straight uptubes. Look for any deformation of the bracing gussets. Look for cracked paint on those gussets, or on the top tube, or the uptubes. To the extent possible, measure the angle of the steering head (27 degrees) with respect to flat ground.
I hope this helps and, also, hope others correct me if they know I'm wrong.
Richard L.
http://www.central-wheel.co.uk/