I purchased advance tickets to Glasgow from Salford Crescent for tomorrow (Tues 13th Feb) several weeks ago. I bought the tickets in person at a booking office and paid cash. On the tickets the departure time is printed as 08:38 (I will be changing at Wigan and arriving in Glasgow just before midday). However, when I recently checked the itinerary online, that train now seems to be timetabled to depart Salford Crescent at 08:32, not 08:38. Is this likely to cause me any problems regarding the use of my tickets?