I cleaned up the seals a little and put some silicone lubricant on them,where the struts join is bone dry, so I'm not thinking it is those, I had thought the little gaiter that holds the wire loom, it does appear to be wet but is fairly solid both ends with no obvious damage, if I cover the window seal and it still leaks I will look here as my next port of call, although I hadn't even thought of the washer jet!
I plant to remove the rear wiper and washer jet anyway so it would be a result of it is that!
I'm hoping to get the Zender spoiler, I have located one but it's just a matter of getting it paid for and shipped!
