By sam.harrison@iliffepublishing.co.uk (Sam Harrison) A turkey sandwich, some strawberry jam and a microwave meal for one – sounds like Christmas to me. This year, we wanted to answer a simple festive question: Can you buy your Christmas day lunch from a petrol station forecourt? We wanted to see if it was possible for late arrivals to buy a last-minute lunch from one of the few shops that would be open on the big day. I decided to stop at a Londis next to a Texaco service station with some particular items in mind for my shopping list. To me, Christmas dinner is not a roast dinner – there has…