Legal issues of me making a Twitter account highlighting my former boss is a sex offender?

(UK) I had a boss in retail, absolute arsehole, but he left after sex offence accusations were made against him at work. I've no doubt he was offending as he was a total creep and a bully. If I made a Twitter account purely centred around this and started posting in places I knew he and his current employer/customers would see it, would this get me in trouble?