Lyn---didn't Dennis say it wasn't in Suffolk ( because it's not) and I think you talked yourself into saying East Sussex in error, so you might like to take a second look at Eastbourne.
Dennis has clearly been driving along the A259 from Hastings to at least Brighton, and the Sleaford tower is surrounded by roads and pebbles. I do believe Dennis's tower is showing Eastbourne; similarly styled to the Sleaford one.
Indeed, some have been turned into homes and one popstar lived in one and U2 should find this one easier Ron to guess who?