These guys suck all round. I took my car in for a puncture. The tires were expensive and less than a year old. Without even looking at the inside of the tire they recommended getting a brand new tire. I took it back to Johnston and Magwood - where I originally bought the tires and they concluded a puncture fix was sufficient after a through inspection of the inside.
To add to this they made we wait nearly 30 minutes while they bungled the paperwork and wrote me up for an invoice that assumed I did change the tire. Stay away unless you must go to them in an emergency.