Where can I get radiator hoses for Fiat Ducato / Talbot Express?

I want to change all the water hoses on my 1993 Fiat 1.9 diesel Ducato motorhome before they pop at 02:00 on a motorway in a thunderstorm. Main Dealers just laugh at me and tell me don't be silly it's over ten years old. We don't stock and we cannot get any parts for anything over ten years old. Go Away! So presumably using their logic, if you pay £100,000 for a new motorhome then it will cost you £10,000 per year to run, just in depreciation. I can get quite a good annual holiday for £10,000, and without even having to resort to Ryanair.
Unfranchised spare parts shops don't list them either. Anyone know of anywhere that has any in stock?