Hi, welcome to Just Answer. I will help you with your question.
The grant of planning permission is nothing to do with your right to light. The planning is a public law issue, and regardless of what happens with that (granted or rejected) you still have your right to light.
So this is seperate to planning law, ok.
If the deeds state it is over certain windows that no longer exist have I 'given away' that right?
Yes, most probably. The right to light must be by reference to a defined aperture, a specific window, if you like.
We are in the process of demoliting that part of the property which will now be a garden/courtyard but once the house has been constructed in shadow much of the day, are there any other legal options?
If you're replacing the window, that might be another option, but again, it would have to be the same in essence to be using the same path of light into the building/window.
To preserve the right to light, there must be a "coincidence" between new windows and old. But removing them completely is likely to extinguish the right.
ok, thanks for your help.