Going to start today, father in law popped round to give me advice and I'm sure he is right. He has taken a line for me to start so that the top of my tiles finish on the window ledge so then the tiles on the window ledge cover the top of the wall tiles.
This then means the tiles that are going to sit on the work top will need some cutting but he said that is best as worktops aren't always straight and it's the best way to hide any unevenness. The only issue with this is that it's going to be a pig cutting around the 8 sockets I have in one line 😣
He also said don't worry about using a spacer for the tiles which sit on the worktop. The last picture is if I used a full tile on the bottom row but he said not to do that.