vbc said:
How about another Raleigh, man?
The Raleigh Royal look like a value for money tourer.
Edinburgh Bike Co-op do reasonably priced tourers.
it's really a subjective thing and there is no definitive answer.
For what it's worth all four bikes of mine and a fifth that is about to be refurbished can all be used for touring but they are very different bikes:
Dawes Galaxy - made for the job
Dave Yates' Randonneur - audax/light touring
Ridgeback Adventure - hybrid but had a rack fitted and has been used for weekend tours.
Trek 4500 MTB - has the rack mounting points but would be the bike of last resort.
Look at your budget if it's in the £400-500 then the Edinburg and Raleigh bikes will serve yuo well.
If you have £600-700 then Dawes Galaxy
If you have even more to spend have a look at some of Cathryn's suggestions.
You could always buy second hand - there's some bargains to be had. I got my Dawes Galaxy for £200 and my Ridgeback for £70. The frame for my Dave Yeates was a snip at £240 vs list price of £740
Have look at adtrader.co.uk that's where I got my foirst two bikes, just be patient and something will turn up.