I decided it was better not to cut the pipe as it is not the usual rubber but a stiff pipe so I cleaned it thoroughly with IPA and sealed it with an epoxy resin two pack. I left it until this evening to fully cure and it is now dark so not yet sure it has worked. However I can get no water to the front or rear wipers, only the headlight washers work
I even tried a wet and dry vacuum cleaner over the jets but no joy, not great in this weather.