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@Olly398
Oils have improved and manufacturing tolerances etc probably have too, but the fundamentals of engines have not changed since Carnot. Still lots of metal moving around, fast and with lots of force, with very close fits to other bits of metal. They can never be machined perfectly so bedding in allows the final bit of deformation to occur sympathetically. So pay attention to the manual! You ought to be glad you've got a nice long tedious journey to start munching through those 1,200 miles and anyway at 4,500 in top gear you'll be in license losing territory I expect even on the motorway.