If you are planning to go to the Hobby Crafts Show at the NEC, Birmingham in March it might be worth checking out this link:-
If you have a Tesco £2.50 Clubcard voucher you can exchange it for a token that will give you admission to the shows. Check out link for FULL details. I am not sure if you can do it for any of the other shows around the country.
You must order your token before March 11th.