Solutions
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Tinydancer1986's post in May-day coolant leak on my Felicia l.3mpi was marked as the answerAll done the silicone reducer fitted (with some lubrication) and I found a hole in the metal tube, witch was fixed with a £5 replacement from the scrappy so job done.
So to any one with the same problem, look for silicone joiners. The type for ali pipe you see on "tuned cars" for the size try 42mm to 28mm as mine was a really tight fit, it only just got on the water pump spout.