Having dug out the April 1989 issue of RAIL Magazine that describes the planned launch with that year's May timetable change, it was essentially a branding exercise intended to unify Provincial sector services across the North West in a manner that aped Network Southeast.
It was a partnership between Provinicial, GMPTE and Lancashire County Council, and was quite geographically expansive, covering all Provincial services within an area bounded by Barrow, Blackpool, Chester, Crewe, Buxton, Littleborough and Colne.
The key intention was to take advantage of the new Windsor link (opened in May 1988) and rationalisation of the Piccadilly station track layout that autumn with a new timetable that better integrated services across Manchester, while also improving the provision of customer information and the station environment.
From May 1990, Blackpool North to Man Vic services were diverted to Piccadilly and ran through to terminate at Stockport. Services into Manchester from Blackburn and Buxton were increased to half hourly off peak and timings accelerated through use of Sprinters. Oxford Road to Chester services were extended back to start at Warrington and run via Piccadilly and Stockport to rejoin their former route at Altrincham, and Barrow and Furness line stations gained a 2-hourly through service to Manchester.
According to 'The Regional Railways Story' by Gordon Petitt and Nicholas Comfort, the brand's downfall came quickly in the second half of 1990 as a result of the complexity of this timetable, due to unreliability of the Pacers, Sprinters being away for modifications, unavailability of parts for the remaining heritage DMUs, tight turnaround times and more workings being diagrammed than there were crews to work them.
As a result, I don't think the brand actively survived beyond the public launch of the Regional Railways rebrand in 1991: The original intention was for 26 class 150/2s and 8 class 156s to receive the red and grey stripe on their Provincial livery (with the potential for the 156s to be delivered new in the scheme), but ultimately only 7 class 150/2s received the stripe, and a number of Newton Heath based 142s had the red and white 'NNW' insignia applied to their Provincial Railbus blue livery. A couple of the 150/2s had been repainted in the new GMPTE dark grey/red/white livery by the end of 1992 (that scheme having been launched in early January of that year), and the remainder were in Merseytravel livery a year later.