£5 off Edinburgh Dungeon (buy a bus ticket £1.20) Lothian buses
Sorry, realise this will only affect folks holidaying/visiting in Scotland over half term, but if you are heading there... if you buy a ticket from Lothian Buses (the predominant bus company there), on the back of the ticket you will find a voucher for £5 off entrance to the Edinburgh Dungeons - one £5 voucher per bus ticket. Bus tickets cost 90p per child, £1.20 per adult so potential saving of £4.10 per entrance! It is £1.20 whatever the distance. Also, Lothian offer a £3 all day (any amount of journeys) ticket for an adult (and a similar child's version - can't remember exactly how much) so it may be worth your while asking about those and get an even bigger saving!