Rover 25 Petrol 1.4 year 2000 - Thermostate Leaking near water pump - Delysher

Thought it was the water pump leaking.

it is the plastic type thermostate ( near water pump ) leaking not the water pump.

How long should the thermostate take to replace and likely charges ?

Rover 25 Petrol 1.4 year 2000 - Thermostate Leaking near water pump - Railroad.
A fiddly job on these due to the location of the thermostat, but it shouldn't take more than an hour. I've done them at the roadside when I was a patrol.