British actor

[ThankYouForWaiting]

I'm really hoping someone can put me out of misery figuring out who the actor is I'm thinking of, as it is truly taking over my life!
He is a British actor, usually plays middle/upper class. I think he must have been at least 50s in the 90s (massive apologies to him if I'm miles out!), silver hair and moustache. I remember him playing slimy characters but I can't honestly bring one to mind.
I've google imaged for days but can't find him as I'm not too sure on search terms. Please can anyone help?

Henry from Drop the Dead Donkey?

Laurence Olivier?

James Fox?

Simon Williams.

Ed Harris always reminds me of Willem Defoe but he’s American eh…
im lost but I’m equally annoyed now!

Derek Jacobi?

No to all so far, but I think Simon Williams is close as he also has a similar smirk.

Donald Hewlett?

Steven Berkoff?

Swiss Toni?

Martin Shaw?

Sorry! He's definitely British, I'm sure he's been in Midsummer Murders a couple of times, possibly Howard's Way and maybe the Bill.

Sam Elliott?

British or American production? Film or TV? Lead, supporting or character? 🤔

Rupert Everett?

Paul Eddington

Kevin Reardon Lloyd?

Trevor Howard

Timothy Dalton?

My first thought was Terry Thomas

https://www.google.com/search?client=firefox-b-d&q=terry+thomas&tbm=isch&sa=X&ved=2ahUKEwj-4P3zy5aAAxVZW0EAHe8iDxkQ0pQJegQIDBAB&biw=1366&bih=681

British TV usually, a supporting character I think, maybe the lead's barrister for example. Definitely more than a background character.

Oliver Ford Davies?

Simon Callow? Have we had that already…

Ian Richardson

No idea but can you remember anything you might be able to use to get a cast list from IMDB? E.g. if he's been in Midsomer murders can you remember any plot details that could be googled?