I can recommend Jonathan at Feline in Croydon as well, they've just refretted my telecaster - wonderful job.
His prices are here
http://www.felineguitars.com/repairs/repairs.htm.
Doesn't look cheap when you add it up - seems quite scary if you've not even thought about it before - but I would stress what Wez said about cheap quotes, it's quite a piece of surgery to get it just nice. Ten years ago I let a friend do his first refret on a guitar of mine for cost - it plays, but fret ends are a little inconsistent, he damaged the board a bit here and there. I knew what he was doing and I'm happy with the choice I made at the time... but it's your baby and you're going to have to live with it afterwards.
Are you getting buzzing on the worn frets? If it's not severe, and they've never been dressed before, then you might have a few dresses in it yet. My tele was easily dressable, but as I've had it new only 7 months, it was obvious I was wearing into the soft frets quite quickly, so I reasoned that I could easily spend the price of a refret (with quality, harder wearing wire) on fret dresses over a year or two!!
If you find a decent luthier like Jonathan, he'll be upfront over what's involved, hidden costs etc (eg you'll probably need a new nut on a refret) he'll look yours over, advise you on your options, etc. Hopefully you can get to see and feel some examples of their work as well.