He will be responsible for 79 Peugeot dealers and will report directly to managing director Pierre Louis Colin.
Didlick said “nine years was a long time in the PR role” and that he was looking forward to a new challenge.
He replaces Richard Dyson who moves to a logistics position within the company.
“I’m looking to continue the excellent work carried out by my predecessor,” added Didlick.
He will gradually take over the position through July.
Andy Sutton, who was appointed service and quality director in March and was previously marketing director, will replace Didlick as public relations director.
Christian Stein took Sutton’s role as marketing director at that time.
Further management restructuring, including Sutton’s replacement for service and quality director, has yet to be announced.