ContiSilent Puncture Repair Glasgow?

[EcosseVRs]

Car has developed a slow puncture - slowly losing pressure over a period of days. Taken it to a couple of independents and some of the chains and they claim they do not / will not repair and that I need to purchase a new tyre. The tyre has only done 10K; it is got good tread - it seems utter madness (and costly!) to have to replace. Anyone had any experience of same and able to recommend someone reliable in Glasgow area who could repair?