No. If a bailiff is accompanied by the police, they are only there to prevent a breach of the peace. You cannot be arrested for refusing to allow a bailiff into your home.
You cannot be imprisoned for not paying your debts. However, non-payment of council tax, child maintenance or magistrates' court fines can lead to imprisonment if you 'wilfully refuse' to pay. This means that the magistrates must be satisfied that you have the money but choose not to pay. You should be required to attend a magistrates' court means enquiry hearing before this is decided. This gives you the chance to explain why you have not paid.
