I'm planning my first ever trip (in my (soon to be collected) M3 LR)) to visit family. This will be 200 miles south, then 100 miles east, then 200 miles north (home) over 3 days / 2 night. I will need to get 200 miles on the clock somewhere near Reading or somewhere along the M3 / M40 . . . . what/where is the fastest / cheapest way t do it?