Can I prosecute a bailiff for common assault or ABH?

Yes

Bailiffs may not use force against people.^[1][2]

If you have been injured by a bailiff, then you must seek medical attention, then report the offence to the police.^[3]

You can also bring a criminal prosecution against a bailiff for assault.^[4]

^{[1] Paragraph 24(2) of Schedule 12 of the Tribunals, Courts and Enforcement Act 2007
[2] Paragraph 35(5) of the Tribunals, Courts and Enforcement Act 2007
[3] See Assaulted by a bailiff
[4] See Bringing a criminal prosecution against a bailiff}