Just to add to the toipic, I have found in the past that high engine speeds polish the bores and build up a glaze thus not bedding in the rings.

The way I ran my engine in is this..

Drove round up at varying rates of throttle and loads, keeping below 3000 rpm) for 100 miles and dropped the oil/filter. Replaced with fresh stuff.

Drove round for 400 miles at varying rates of throttle and engine loads still keeping below 3k until about 300 miles had been covered. Drop the oil/filter and fill with fresh.

Drove round for 500 miles allowing the turbo to come on boost occasionally and slowly reving it higher and higher as the miles clocked up. At 1k miles, drop the oil/filter anf put the good stuff in. Caned it for another 1000 miles before upping the power.

I live not far away from the pennines so have some ideal hills to load the car up with.