I have managed to clear the blockage, ended up cutting 20mm from the end of the tube and hopefully this will sort it out. I have order another hot end with the tube etc so will replace at some point when this eventually arrives.

I order some more nozzles, I have fitted one of these fine but having problems with the sock. There is only one way these go on as there is one side clear, I get that bit. On the ones I have (5 of them) the hole is not in the centre, its more to the front which means that the nozzle is not aligned to this. Do I have the wrong ones?