Original: Unfortunately, as the privatisation of British Rail began, this project became unviable, and Strathclyde ended up receiving a batch of Class 170 units.
Simplified: As the Privatisation of British Rail began, this project became unviable as resources were concentrated on the privatisation process, leading to the famous 1064-day 'drought' of new train orders. By the time this period was over, plans had moved on and Stratchclyde ended up receiving a batch of Class 170 units.