[ontopic]Yo Its_ welcome to the wonderful wheely world of the pedaler....
Your Dawes, is it a discovery type? flat handlebars, 32c wheels (says on the sidewall) nice light alloy frame? If it is then i would say just go for it. I asked a while ago if it was worth getting a hack bike for winter, but it was pointed out to me that you feel much better, and ride more with more enjoyment on a good bike than a bad one. Unless your planning on pounding the trails of Glentress then your hybrid should be well up to the job, Id take one up the water of Leith for example, tho you will have to carry it up the odd step.
I had a Discovery 301 for years, I used to use it as a jump bike and did some pretty high speed trail riding as well as leaning how to cycle down flights of stairs. It survived (except the transmission, but I'd never heard of maintenance at that point) 10 years and would still be with me now it it hadnt gotten stolen. grr.
It sounds like you are really enjoying the new bike, so keep with it. I don't know any back paths in the 'burgh to trouble a hybrid.
However having said that fixing the old one up to a good working standard is a great project and way to learn about bike mechanics without experimenting on your new shimano components.
I totally agree with all the other advise here,specially on taking it easy and enjoying yourself.[/ontopic]
2 continental City Contact in the post, I'm well excited as these are the first tires I've ever bought not attached to a bike. More scotchlite, hoorah!
Rugg Tomcat AKA 'wants to be in Tron'