The Dawes Fox was near the bottom of the Dawes range but it's still a nice bike. I'd say it's definitely worth some light restoration, as long as you aren't expecting it to be worth a fortune.
This is my one.P1050366
, on Flickr
It had the wheels replaced with 700C alloy wheels before I got it, and a few other salvaged bits had been fitted.
After being impressed with the Suntour gears on another bike I collected together a New Winner freewheel, VX rear derailleur, Compe-V front derailleur and Power Shifters- mostly from poor listings on eBay.
If your one is working at the moment I would suggest a similar approach, ride it and replace/upgrade bits as you go. You can buy new wheels that look the part at a reasonable price or look out for some second-hand ones locally. After that it's just a case of fettling as you see fit.
1979 Dawes Fox
1982 Dawes Super Galaxy