bathroom tap

Hello Folks By way of background... Old tap model Deva DCM113 leaked leaving pool of water around the rear of the tap. Old tap removed and new tap of same model installed but the same leak is present. The plumber returned and did spend a fair bit of time checking the tap & piping and said...

I think this is a simple question. This tap needs replacing. It has a pop-up waste but we just use a plug. What taps can I replace it with? Obviously only a tap needing one hole, but will a mono mixer work? If we want to use a manual plug does this rule out any taps? Or can we just not install...