Well I didn't until after the post! Take a closer look at the narrow gauge point, see what I did. I've no idea why or what I was thinking. I've arrowed the problem below.
So out came the soldering iron and off came the rails (arrowed) and I re built the point as it should be, see below.
Now I need to fit an operating mechanism for the switch blade and then the narrow gauge will be ready to try running a loco on!