Welcome Hoggy from sunny Italy.
1) Inspect coolant hoses for any rubbing points against fixed parts of the car - bottom hose susceptible on a +4 IIRC - someone with a +4 will correct me on this.
2) Check the fit of the coolant header tank and make sure none of the pipes are trapped against the wiper motor.
....... Clip
Good luck.
1) The lower coolant hose can rub against a sharp edge of the engine castings. If that is the case loosen the clips just enough to move the hose and then re-tighten the clips. The sharp corner could be relieved with a little work with a file too.
2) Check that one of the hoses to the coolant header tank is not chaffing where it passes over the angle at the top of the foot well.