Section 63 of the Tribunals Courts and Enforcement Act 2007 defines "Enforcement Agent" to be an Individual.
Bailiffs (Enforcement Agents) not registered for VAT cannot recover VAT on their fees. It does not matter if the bailiff's office, company or firm is VAT registered. A company cannot be an "Enforcement Agent" and cannot recover VAT from debtors.
Search the HMRC register of VAT registrants to see if your bailiff is registered for VAT. You can ask the bailiff to show evidence of his VAT registration certificate.
If you have been charged VAT on bailiff fees and the bailiff is not registered, you can ask HMRC to investigate VAT fraud. Always include a copy of your bailiff's document or other evidence showing you were charged unregistered VAT.
HMRC also has a fraud hotline: 0800 788 887.
You can recover unregistered VAT by reclaiming it through Money Claim Online (MCOL).