After a colleague had two punctures on his ebike I decided to persevere. GAADI had a bit of hassle finding a carrier who would actually carry them, due, I suppose to BREXIT paperwork but they arrived this afternoon. Hopefully I will never have to use them in anger but who knows ?. It's a pity there are no Marathon PLUS tyres of that size.
So ...... if I do have to use them I'll let you know.