We do get the occasional TV drama from Oz in return. There was a series with an aboriginal detective which was good , You can keep Neighbours and Home and Away.
There are some good series from across the pond as well. I wish a UK network would buy "It's always sunny in Philadelphia".
There is a Canadian police drama being shown currently called "Cardinal" Brutal stuff'
I haven't watched The Detectorist but I am a fan of McKenzie Crook

Although not strictly British, may I suggest Father Ted, I suspect that if you have not yet encountered it, you will love it, should you have seen it already, I'm sure you'll go back it soon.
Then, Hitchhikers guide to the Galaxy, I suggest the original series rather than the movie.

I know what you mean about the revolving door of actors in UK drama, but that said, it is probably the best TV drama in the world followed by the Nordic Noir genre.

Of course you’re welcome ..so G’Day to you! We are an eccentric lot...not just the English, but they do it better than the rest of us! I think our two national institutions...the NHS and the BBC are both national treasures, and we have to protect them at all costs...especially from the Tories of Boris and his ilk! As I’m a Scot who lives in Northern Ireland, and not looking forward to a future under the Tories and out of the EU...I too think Scotland needs to get back to being an independent nation, unshackled from English nationalism. Although I dearly love our English neighbours, some of them (The Brexiteers) are quite unlovable!