Armed with three stages, more than 100 bands and a camping space, the event promises to be the biggest yet. Its a good thing then that The Hunts Post has two pair of tickets up for grabs, with the likes of Pure Floyd, Mostly Autumn and Purple Jimi taking to the stage. Before the official event, a charity concert day will be held on August 3 in aid of Addenbrookes Hopsital. Deep Purples Don Airey and Friends will perform, as well as The Broadside Boys and Fresh Cream. Kicking-off the main event though, Pure Floyd, Atomic Rooster, Miss-Led, Purple Jimi and Ozzy Ozzspawn will take to the stage, based at the Haggis Farm Polo Club. Rod Stewarts former musical director and co-songwriter will even be at the festival, performing with his group Cregan and Co, as well as Colour of Noise, Mostly Autumn and Malaya Blue. To be in with a chance of winning a pair of tickets for August 4 to 7, just answer this question. How old is Cambridge Rock Festival? Answers on a postcard to: The Hunts Post, 30 High Street, Huntingdon, PE29 3TB or email: email@example.com Deadline is July 28. Entries must include a daytime telephone number. Usual terms and conditions. Editors decision is final. Tickets start at £25 for a single day, or £20 for the charity event. To book and see the full price list, visit cambridgerockfestival.co.uk.