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See a pro, your setup sounds very confused.

You can pause any video of any decent player to see the difference between wrist angles at address, backswing and release.

Padraig Harrington did a nice video about wrists and it might help you understand why your setup sounds odd.

 
At address, your right thumb should be on top of the shaft.
At the top of your backswing, your right thumb should be underneath the shaft.
Then let the release happen naturally.
KISS
 
Underneath the shaft? Not sure I can twist my arms that much!

You've lost me, I'll try and clarify as some people have their right thumb down the side a bit.
Think of your left thumb being on top of the shaft at address.
At the top of your backswing, your left thumb should be underneath the shaft.
This is going back to the same idea I tried to give you when you were looking for more distance with your driver
 
My bad I misread your reply. Get that thank you. Backswing is not my issue, it's about address and whether your wrist set is the same at impact. Thanks

I've done what you do for sometime now and certainly have hit the ball ok. In a lesson a couple of weeks ago my pro said he was quite ok with that set up and swing, but asked at what point I released the right hand. I said, as near impact as possible, he felt I should be releasing when the club is parallel to the ground on the downswing at the latest.
 
It's easy to get very confused with what is taught in the golf swing.

I find this is the best way to consider the arms and wrists. The arms and wrists should be lifted up and down only in the swing, they are not pulled around your body. The around part of the swing is made by the torso and shoulders rotating.

This video by Danny Maud covers some basic essential swing moves but #4 explains the way to use the arms and wrists correctly and simplifies the concept.

 
So this would imply that at impact my wrist has 'extended' (for want of a better word) beyond the set up/address position, just as if you were hammering a nail in. Does that make sense?
Yes. Hammering a nail is an excellent way of considering how to strike a golf ball.

If you were to imagine a nail tacked onto the golf ball at an angle of around 20 Deg and to make your objective to hit the nail down through the ball into the ground then you would instinctively understand how to use your wrists.
 
I like Danny Maudes video there, forearm movement could explain a lot for me, as on setup I square the face I use my right forearm to do so, resulting in a slice
 
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