Sorry but I think that you might be out of luck. The Radio Times website normally lists all programmes scheduled for transmission within the next couple of weeks, together with their availability on catchup services. There is no listing at all for your programme. Further, the relevant page on the Yesterday TV website doesn't give any mention of scheduled transmissions (and Yesterday doesn't offer a catchup service either).
But it's bound be come back fairly soon. Everything on Yesterday seems to get repeated ad infinitum (or, in many cases, ad nauseam)!