wet weekend - under the car

[ric p]

I believe that the 400se has a small leek from the radiator. Water can be seen dripping from the underneath of it from the frame that supports the oil cooler and fan shroud. With the bonnet removed it is also damp inside the shroud at the botton.
What is the radiator originally from or is it worth getting it re-cored and increase its cooling capacity.
Any ideas and cost especially in the Somerset area.
Thanks