How much should I pay to have a new kitchen tap fitted?

[NorthAngel]

Hello,
I’ve bought a new tap and tried to start it myself but gave up! How much is the going rate for a plumber?

We just had a new sink and tap fitted which was £100 so at a guesstimate £40/50.

Ok, thanks

London here - I was charged £100 to replace a kitchen mixer tap .I provided the tap.
The pipes had isolating valves ,straightforward .No trouble with turning the water off .
I thought it was rather expensive .