Recently, I've found that there's a host that actually does do something quite different here: Rob Bell. A lot of his works are for Channel 5, so they might be hard to find (I haven't looked). But they're very much focused on British engineering and British culture. I haven't seen anything similar in about a decade, when the BBC channels would often air lots of cultural and historical documentaries.
The ones featuring Rob Bell for C5 have a very limited budget, it's quite nice how simple they are.
Rob Bell... looking him up, sounds vaguely familiar... which will because I watched one of his programmes the other night about the old railway lines of Cornwall. He is very good indeed.
Tim Dunn is very good too, his series "The Architecture the Railways Built" is superb, on the Yesterday channel. I also avidly follow John Rogers who does a lot of material on London, you can find him on YouTube. He films it all himself.