We got their number from teletext last August, when we struggling to find 4 flights for the last 2 weeks of school holidays. They managed to book us 4 Virgin flights from Manchester at reasonable prices for August and quite cheap car hire with Dollar. They were very helpful and the tickets and car voucher came within a couple of days in the post.
We booked our accomodation so can't comment on that, but we had no problems with the flight or car.