There are usually two hamster shows a month taking place somewhere in the UK and these are a great opportunity to compare your hamsters to others.
There are 3 clubs in the UK and each has a pet class at its shows. In this class the hamster is only judged on tameness and condition.
If your hamster is too cute to keep to yourself, why not take them to a pet class?
Should you be interested in exhibiting in the main show it would be best to enter the pet class first and whilst at the show talk to one of the many people there. They will be more than willing to help. You can also read about exhibiting your hamster in some of the hamster books which you can get from your local library or look online for your local club.