In reply to Bluebird:
3 miles is quite ambitious for pmr, we use cobra's at work as safety radios and they have a limited range unless you have a good line of sight. If you want an extra that will work reasonably well most of the time then they're cheap and suitable for a bit of fun when out walking. If you are looking for something reliable and with a few miles range you're probably looking at stumping up for a licence.
If you're going for pmr my advice would be don't spend more than £20-30 per radio and get a waterproof cover, replace them when they pack up. You pay another hundred for the same thing in a fancy waterproof package with the same range and technology.
