[Chrisr]

I agree with Mick. Its the early pale A/A type. I would place the badge as 1970's rather than 1965 when the gilt/brass badge was still in use.
Below on the left is the A/A version and on the right is the gilt/brass version.

Close up of the A/A below and a better shot of the two types together. Only way to confirm is the rear stamping (A/A on the right below) and whether it has sharp prongs rather than loops to secure to the hat?

The badges is placed too high on the brim to have been put there by a soldier - should be centered between the top of the brim and where it turns up.

Cheers
Chris