What sort of visit is it? Generally speaking you can deny a baillif entry unless he has a warrant. Make sure that all doors and windows ate closed as they can enter through any they find open.
If they do come in they can do a walking possession and note down which goods they are interested in. If you don't pay them then they can return and take these goods.
You can find more infirmation on the Directgov website.
Follow through Make your dreams come true Don't give up the fight You will be alright 'Cause there's no one like you in the universe