I would like a bit of advice/opinion on a small modification.

[Squirrelking]

Massive improvement! Good work. God only knows what they were thinking making it so thick!

[jonnyone]

I must admit that I like the idea of back up open sights

Anyway I was thinking about going for maximus suggestion as I liked it, but had another look at the factory sight and made some subtle changes and now I am actually satisfied, I got the post to a nice shape then took of the corners and hand finished it, even though its plastic is so robust and has a smooth solid lever lock up so the factory sight is staying.

I wonder if I will change my mind next week LOL.
Here are the subtle changes
https://imgur.com/9Oq6wer

Nice Barry.
Its a shame that Diana couldn't knock them out that profile at the factory as the current set up is not good. The factory foresight post looks the thicknesses of a scaffold pole down the sight line. Your re profiled one looks as if it will give a much clearer sight picture and perhaps a corresponding increase in accuracy.
My eyes are not all they used to be these days so I think I will be sticking with scopes unfortunately.
Dave