Hi Bryan.
The building is regarded as an iconic example of 'brutalist' architecture, although its the concrete balustrades on the car park above that really stand out. More info:
http://www.dezeen.com/2014/09/12/brutalist-buildings-preston-bus-station-by-building-design-partnership/.
It wasn't demolished (one reason I left the film processing so long was that the original idea seemed less relevant because of this). After 10 years of the city council trying to knock it down, it was Grade II listed last year (meaning that any future changes to the building will be strictly controlled). It has been handed over to Lancashire County Council and there are current plans to turn part of it into a youth activity center.
During those 10 years it has had no investment and very little maintenance (apparently the city council couldn't afford to run it despite its 1,100 space car park). They wanted to flatten it to make way for a '2 billion GBP' shopping development (where that cash was coming from wasn't clear - nor where the buses would go either!).
Mostly, I'm impressed with the results given that the film was exposed a decade ago. There might be a 'part 3' still to come - the idea I had then hasn't worked as well as I'd hoped though...
John.