Hi,
Changed monobloc mixer tap on basin to Led waterfall tap, only problem is not enough pressure to operate tap. I do have a power shower pump near by can I connect tap to this? Cold water tank is as high as it will go.

I don't see any problem why it should not work. If you get too much water flow from the sink top after the pump is connected, turn down sink shut off valve under the sink until you get desired water flow. That will restrict a flow a bit and at the same time it will regulate water flow. Hope that helps. Let me know how it went. Milo