In a Cabinet Office-backed campaign, JLGB is aiming to address a shortage of adult volunteers at its groups across the country.

"The biggest gap is among 21-to-45-year-olds, who naturally become more focused on their careers and families," explained JLGB chief executive Neil Martin."We're looking for new adult leaders to be mentors and coaches."

Case studies promoting the campaign, Do Your Bit, include Rochelle Schwartz, 48, who describes herself as, "one of three London girls who married three Cardiff boys who we met through JLGB.

"Ours is the only Jewish youth group in Cardiff, Swansea and Newport, so it is vitally important to our community. I help to instil a strong feeling of family and community and both Jewish and British values."

Another featured is Michael Gladstone, a 28-year-old management consultant and Hampstead Synagogue member.

"We all have other things to do in our busy work and personal lives," he said.

"But giving a bit of time to something like JLGB can make the world of difference."

The campaign is being promoted through social media.