None
The Ministry of Justice maintains the public register of Certificated Enforcement Agents, which you can access and search.[1]
The search results give the bailiffs date was given his certificate together with the name of the company that he works for.
The bailiff company lodges a bond of £10,000 with the court as a security for the bailiff to collect debts and hold public money on the Courts behalf.[2]
If the bailiff appears in the register without a company name, then the bailiff has lodged his money to lodge with the court to get his enforcement certificate, or taken out a policy where an insurer acts as guarantor if a claim is made against the bailiff.
The bond is a statutory requirement and the court may award a payment from the £10,000 bond if a party makes a formal complaint about the bailiff.[3][4][5]
[1] Search the Ministry of Justice Public Register of Certificated Enforcement Agents
[2] Regulation 6 of the The Certification of Enforcement Agents Regulations 2014
[3] Regulation 9 of the The Certification of Enforcement Agents Regulations 2014
[4] Procedure: Civil Procedure Rule 84.20
[5] Prescribed complaint form EAC2

Protect your car from bailiffs | Recover Your car from bailiffs | Attending a bailiffs vehicle pound | Reclaim bailiffs fees | Getting a chargeback | Attending Court | Arrested? | Bailiff Law | Your bailiff FAQs | National Bailiff Advice | Beat the Bailiffs | About Stop the Bailiffs