The coach journey itself will vary depending on your location in the UK, however as a general rule it will take around 24 hrs or so. The coaches will take the ferry from Dover to Calais/Dunkirk which will last approximately 1.5 hours and then will continue into resort making a couple more refreshments breaks for you to stretch your legs.
As you come into resort, your coach may stop at a supermarket before making the ascent up to your accommodation, providing you with another opportunity to grab those necessities for the week ahead at a lower cost than on the mountain. This supermarket trip will depend on timing however, as the main priority is to get you to resort in a good time; it may be closed by the time you approach resort.