I met my future wife in 1969, and by November that year we had married, in Preston as she was a 'Preston girl' (literally, as 21 was still the age of majority then.) My first experience of Preston came in that September, and we trekked up from the station to catch a Preston Corporation bus to the Larches Estate, route number P1, a jointly-operated service with Ribble. Being the evening, the service wasn't great, so to save waiting an inordinate time we caught a P3 Lea and walked the last bit. That was where my first experience of local dialect came, as a soft Southerner I assumed the pronunciation was Lee, rather than Leah with a pronounced emphasis on the last syllable. I think the bus stop/terminus may have been in Lancaster Road, but I stand to be corrected. The P1/3 were still operated by Leyland PD2s with, of course, those wonderful Leyland bodies, but within a few months they'd been superseded by Leyland Panthers, an unjustifiably maligned bus imo.
Anyway, I learned then that the bus station was being built, and heard a lot more about it when I .met with some trepidation my future parents-in-law. Vic worked for Ribble, and before that Scout Motor Services of Preston, and was very knowledgeable on many aspects of bus operation without being in any way what could be called a bus 'enthusiast', and was mildly amused by my love of buses. It was a job of work for him, a job he did with a huge sense of duty but absolutely no emotional involvement. His view was that the bus station was a huge waste of public money, and he never warmed to it, being particularly critical of the huge pools of water that bedevilled the pedestrian underpass. Mind you, being an inveterate food shopper, I think he found it useful that there was a Morrison's supermarket in the underpass, and then he could catch the bus home!
My own view is that Preston Bus Station is a brutalist masterpiece and, apparently, still fulfils a purpose. My parents-in-law are, unfortunately, long dead and we have no reason to visit Preston any longer (though 2021 Preston Guild may provide an excuse). Knowing it from its early days, I'd say it was 80% used on the Preston Corp side and, perhaps, 60% on the Ribble side, although there were coach companies using the latter side too: my parents-in-law, who never drove, kindly accompanied us on half-day coach trips to e.g. the Lune Valley or Forest of Bowland, and there were booking offices for two or three of them on the bus station. There was also a café, which was good by southern standards but not wonderful by Lancashire ones!
Anyway, long live the Preston Bus Station.