The only thing I make sure I to do it never rev the car over 4K when cold no matter what miles is on the car. Is there a need to 'run in' cars anymore?
I guess it's not running in like in ye olden days in your Austin A30 but I still like to give the whole car chance to bed in a bit, engine, turbo, wheels, tyres, gearbox etc.
So I try and vary the revs, keep it below 4k rpm until that point where the ECU seems to trigger the engine mapping to run a bit more enthusiastically after about 500 or 600 miles or so.
I think I just have too much mechanical sympathy for my own good!