Hmmm..... a pet subject of mine.
Middlesbrough is a classic design and still works as well as it ever has and is still in relatively good condition. It's something that should be listed before the local councillors demolish it in favour of a smaller, less functional facility in a daft location to "improve connectivity" etc.
Preston is just a fine example of Brutalist architecture and for that reason alone (and despite other failings), I think it's great.
Other faves....
Leeds Central - good location, good design, and a quantum leap over what it replaced (for those old enough to remember)
Newark - surprisingly good for a small town
Hanley - good facility.....just needs to be effectively connected to the rest of the city centre (but appreciate development had stalled)
Swansea - just very good
However, special mention and a left-field one is Yeovil. Not because it's good because it isn't. It has grim public toilets, the travel office is closed and seems to be a place for drivers to take breaks. It just gets me how it's in a timewarp.... aside from a bit of signage and some new shelters/barriers, it is unchanged since I first went there in 1991. The Gorge Cafe is unchanged since the 1980s.... you almost expect to hear Ford Transits running the town services.
Yeovil Bus Station September 1986 Copyright Steve Guess MMXVIII
www.flickr.com
53054 taken at Yeovil Bus Station
www.flickr.com
Some local authorities and PTEs are very good with their investment and maintenance though, as I've mentioned before, some go a little too far... TfGM with the monoliths like Wigan (especially) and Bolton, and Metro with the bonkers ones at places like Cleckheaton and Ossett.