Thanks for the reply!
Good news is that I have got it to work.
Bad news is I have to "Enable Password Autofill" every time I use it by entering a six digit passcode that pops up in the bottom right corner of my screen. So it's hardly a time-saver!
I have taken a photo (not a screenshot as Windows annoyingly blacks out the iCloud box with the passcode if I try to get one) but alas cannot attach it here as a message comes up saying "There is an error occurred while loading this image. Please try again later." Which is both really unhelpful and very bad English...
Cheers
Andrew