Finally got around to getting my fixed frame powder coated and this is the result (picked it up at the weekend):
Parts are on the way for the rebuild, starting with a new headset and tyres to get it standing on its own two wheels again. I've also bought an old Shimano 600 crankset that I plan to use with a single chainring, figuring this would be better quality than an equivalently priced, new and cheap single speed crankset.
It's my intention to go back to a two brake setup as well (to give me the option of running it single speed on longer / hillier rides) and I'll be upgrading the old Weinmanns to modern dual pivot brakes while I'm at it.
Proper mudguards will also be fitted, now I've gone to the hassle of brazing on mounts for them.