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If i remember correctly turn right out of cadwell stay on that road all the way to a dual carriageway cross roads, go straight on when you get into town or village (can't remember the name) turn right at crossroads.
Hope that helps, its about 10 minutes (5 miles away)
I may also be wrong, but I'm sure once you get into Louth (following Matt's directions) you go straight over at the lights/crossroad rather than turn right.
Shell Optimax about 7 miles south of Cadwell in a town called Horncastle. If you're coming from the South you can't miss Horncastle - not sure where the garage is though.