Re:
Hello,
Not an expert on Dawes but I think the main difference from companies like Mercian, Jackson and so on was that Dawes only made off the peg frames whereas the more expensive builders made individual bespoke frames.
In a way, it could be a problem to buy a used Mercian or similar since it might have been made for a specific person's fit. So you would probably need to check the geometry would suit you (maybe you might get lucky and find one that fits you perfectly). Many of these builders also did (or still do) off the peg frames. I would guess the build quality of these is higher than Dawes, but so are the prices...
Dawes, I suppose, would be more 'one size fits all', so as long as it fits you you're ok.
There are cheaper enamel frame sprayers, Mario Vaz near London is very very cheap (60-odd quid, I think, for a frame respray). He does have a bit of a dodgy reputation for quality, but some people say as long as you keep it simple his work is OK.
A good powdercoat can be very good these. Check out Armourtex - cheaper than an enamel spray but they do quite fancy stuff like metallics. And of course powdercoat is nice and tough to put on a touring frame.
Hope that helps a bit,
Johnny