My last tour this May was for 16 people, staying in hotels, B and B's and hostels for two nights, that came to £213 for seven nights with one night using a Hilton. I think that was the most expensive tour I have set up so far, generally I get a week in at about £170. The nice bit about group trips, (if it is a group trip you are in) is that you can pick up lots of ideas from other folk. If not, any cycle break to scotland is generally good idea.
Good luck