Their estimate for the additional labor is exorbitant given that the water pump is situated, as is typical with most pumps, in the front of the engine and not anywhere else.

Additional quotations would be obtained.

Although I am not well-versed in the items sold in the UK market, I did find a video that demonstrates how to repair a diesel water pump model L200/4D56.

In a perfect world, he would construct this vehicle.

It would be wise to seek a second opinion, I believe; I'm sorry to hear that.

I get it. Is this the system you're using?

Not knowing anything about that model makes me question it's OEM.

Why don't you just take a photo and show us what you see?