The serious point is that much of Britain heritage was preserved by "chance" not design. In the case of Bath, the city was abandoned for a while as people moved back to the countryside. Many stone blocks were pinched from the centre for property elsewhere. People couldn't see the value of heritage at the time.
Likewise British Brutalist structures are endangered, with many being demolished year after year. I'm not arguing for all such buildings to be preserved, but certainly a period of British history, representing what is perhaps the closest we came to a revolution (the mass creation of new civic structures), with a distinct architecture should be preserved.
Note that people are now coming from all over the world to see a power station on London's Southbank! Perhaps not quite queueing up. (Sadly not listed, though Battersea is and is IMO the grander of the two power stations).
I find it interesting that people are talking about preserving this pile of concrete and steel, that is called Preston Bus Station. I am old enough to remember its predecessor in Tithebarn Street. Not that there was much to commend it, but at least it did its job without great expense or having about a third of it closed off because it wasn't needed.
Some of the building that where knocked down to build the current pile and waste of space bus station where nothing to write home about either. So most of them needed getting rid of as much as the current bus station does.
All those who wish to see it get listed status, should contact English heritage and give them not only their name and address, but also sign up for a DD for the rest of their lives to pay the upkeep on the Preston Bus Station. If you want it saving, YOU should pay to look after it, not expect others to do so.
The great pity is that this eyesore is actually surrounded by some beautiful buildings. Such as the Harris Library and Museum, the Miller Arcade, St. John's Minster, the Post Office and even the Town Hall. All this bus station and to be honest the Guild Hall do is to make the town centre look dowdy and run down.
Preston CAN DO BETTER, but the first thing is to knock both the Bus Station and Guild Hall down. Then get a decent designer/architect to create a design that fits the surrounding. But not one of those supposed 'modernists' who have design such other eyesores as in glass and concrete that litter the Town and Cities of this country.
I include such building as the 'Shard' in that, it looks totally out of place. I acknowledge that these are personal opinions but they are just as valid as any other one.