The B&W speakers Martin linked to will be excellent. To drive them I'd be inclined to try one of these. It's the same one my brother drives his B&Ws with, which it does without breaking sweat. Built like a tank too.
https://www.ebay.co.uk/itm/196185218...Bk9SR4ToroOqYw
I gave my old B&W speakers (DM603 S1) to my mate, who runs them with a 70s Sony 30wpc integrated, and they sound not exactly shit, but dynamically dead. No wonder he prefers watching telly these days. Convinced me that having an amp with more than enough welly super important.