Mens/Teen Swimming Trunks Age 16 or Adult Size S/M (Chipping Norton OX7)

I have guests staying in Chipping Norton for Easter, including my 16 year old nephew. The kids have decided they'd like to visit The Lido but George is without trunks. He's age 16 and lean, not at all fussy so long as they fit, and any trunks will do. Happy to collect any time tomorrow from midday. If anyone can help, please reply or WhatsApp/call Annie on 07827 442395. Many thanks