In Edinburgh, Eastern Scottish gained a number of contracts from Lothian Region Transport (LRT) at deregulation, including evening and Sunday journeys on LRT services 23 (Trinity - Morningside), 34/35 (Sighthill - Lochend, circle) and 42/46 (Portobello - Cameron Toll, circle).
Whilst the latter two reverted to full day operation by LRT in July 1989 following retendering, the 23 had its evening and Sunday service restored by LRT on a commercial basis in September 1987.
However, Eastern then decided to run its former contract journeys commercially before adding a daytime service a few weeks later - thus starting a bus war on the 23 corridor which was to last for just over seven years.