Freddie17 said:

…you sure it’s a Rangie and not a Defenderer?

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The factory never fitted sun roofs to defenders. There wasn't any room left in the Water Ingress Manual for another chapter -----

Wimblowdriver said:

0.183 (subject to a VAR check)

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Had to give up on this one.
Yes the diagonal does pass through the centre of the middle circle. But beyond that I could not get.
By extending lines etc there are loads of similar triangles but again I couldn't see how any of that would help.
By drawing I agree with your figure but by trig or other geometry it has me beat to the point I got quite annoyed and went and cleaned the study.
(I always clean something when I am angry, usually the kitchen, but we have a guy coming to fix the laser printer...)

Stone56 said:

Drain tubes blocked open the sunroom and have a look think thay run down the centre post stick a cable puller down it with some soap

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Would it not be safe to blow down it with an airline, gently?

Stanleysteamer said:

Had to give up on this one.
Yes the diagonal does pass through the centre of the middle circle. But beyond that I could not get.
By extending lines etc there are loads of similar triangles but again I couldn't see how any of that would help.
By drawing I agree with your figure but by trig or other geometry it has me beat to the point I got quite annoyed and went and cleaned the study.

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This is how I did it ----