This stuff looks good. They do a diffused version and clear one. It seems the diffused one means the light is evenly distributed through the material but there is a very small loss of light as a result.
I see that it's guaranteed uv transmitting for 5 years so presumably it might need to be replaced after that. But it's really quite cheap.
Alan your enclosure is extremely similar to the design being suggested by the tortoise trust!
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Testudo Hermanni Hermanni (Corse) tortoises
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