Another Dawes lover here, but then I know no different they are all I've had since I started cycling again.
Started on a 201 Discovery hybrid and now ride a 501 and I use it for everything, I do rough (very) towpath riding, commuting, shopping
and touring. Hybrids are excellent at getting people with little cycling knowledge onto cycles.
About 2 years ago, I bought a Galaxy, I'd begun doing 2 day rides, camping. I couldn't get on with it and sold it on quickly. As my distances increased, I did over 300 miles around Galicia and Asturias, (hilly) I began to think seriously about another dedicated tourer and purchased a Dawes Horizon, one of the last steel framed models. Bought an HD rack, serviced it, put on Marathon plus's and.....couldn't get on with it.
I only have the 501 now, it's doing a 50 miler tomorrow, Hull to Fakenham next week and Calais - Barcelona in the spring, it's standard apart from bar ends, a good quality rack and marathon plus's. as others have suggested, I'd upgrade your bike, only where needed, put on some M+'s and get out there.
With the current astronomical prices of dedicated tourers, well, hybrids make even more sense.
I bought the Horizon for £99 and sold it for £365, it's crazy!