https://www.amazon.co.uk/QVS-Shop-Ex...945958&sr=8-29
Would this be safe to use around birds as my ringneck is aggressive and I'm going to use this to cover the top half of his cage so I can let my parakeets out.

IMHO, clear Polytene would not be my first choice as a cage cover, even for short periods of time as it would create a dead air space in the upper cage area. I do not recall Polytene being that clear more translucent.

Why not use you normal cage cover material, just not fully cover the cage. If you do not have one, I would recommend something made from cotton.

You do realize that your Parrot is just going to go to the bottom of the cage to see what is happening and at that point, likely to start screaming.

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I understand but he keeps trying to bite the budgies feet as they like landing on his cage it's an accident waiting to happen and I dont know what to do.

I'm assuming that you are not using a sleeping cover for your Parrots cage. I would look at taking a standard bed, bedsheet and fold it up so that it covers the top of the cage.

If nothing else, it will tell you if this concept will work or not, and your cost into it - Zero!

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Thank you u know if I use the bed sheet idea wont it make the parrot hormonal.

Get clear acrylic sheet from home depot or lowes that's what I use. Its a clear hard plastic.

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Plastic doesn't breathe no air flow and in order to keep the budgies safe you will have to cover the sides as well because they will hang on the side of the cage.
But if you use a light color cloth material light will go through it and it should be ok for the time the budgies are out.

No, you're not building or creating a hut (nest), it is simply a cover on top of the cage and regardless of what is used, it is just a cover over the wide open sides.

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I just thought of something else.
What do you do when your ringneck is out. Doesn't he attack the budgies cage?

No not really it's more the budgies flying to him cause they are so friendly but he does sometimes land on it so I just cover it with paper and he doesn't land on it