Switch ok, the fuse was changed, relay swapped for same in another circuit both relays where working, waiting for better weather to test connections at rear hatch under spoiler, hoping it as simple as bad connector

Hi, looking for advice, The rear heated screen in my RRS isn't working. Switch. Relay, Fuse, and window heating element are all working, I'm thinking a broken wire at the rear hatch, trouble is I don't know where to look, and the colour code of wire. Any help much welcomed, Thanks in advance

Looking at Range Rover l322, for future, but quite like RR sport, what's the difference between them, and which one to go for , I know both have their problems, but which suffers the most. So which ,would be better buy