Each ticket is good for two people to enter the show, simply fill in your details on the back of the invitation for free entry to the show.
Modern British & Contemporart Art
The advance purchase price is £11 each + £1.5 booking fee .... i.e. cheapest entry is £12.5 per person ... and invitation being sold her is good for 2 people, it has a minimuim value of £25.
Tickets sold on the door are much more.
As the show is on from 18-22 Jan 2012 you will have to collect the ticket from Liverpool St station (central London) or take a chance on the ticket arriving in time via Royal Mail.