Rear windscreen washer hose

My Citigo has suffered the not too uncommon issue of the hose supplying water to the rear washer splitting inside the rubber connector between the body and hatch caused, I believe, by opening and closing the hatch putting it under stress.

Having got that waffle out the way I was going to just insert a connector but that may well make it less flexible and cause another split so perhaps replace the whole hose. After a bit of dismantling I have found it in the roof lining by the rear hatch where it plugs into a connector.

So 2 questions, can I just replace that length of hose (approx 1.5m) and if so is it 5mm internal diameter or second idea, anyone know the part number of that piece of pipe with the connectors so it can be ordered off Skoda?

After that I'll bail out the water in the rear hatch!