Hello, I am a solicitor with over 15 years experience. I will try to help you with this.
Her is a guide by RICS re: rights to light which is as good an explanation as I have found anywhere. There is no right to light in the garden but there can be in a house if it has been exercised for long enough by you and your predecessors in title.
I was really asking whether I could do anything about the fact that I (and previous owners) had not been consulted, and given the chance to object.
If planning permission has been granted without the proper notification procedure being followed there is a right to complain to the local authority ombudsman that there has been maladministration by the planning authority. If the ombudsman finds maladministration he has the power to revoke or amend the planning permission this is unusual even before the building has been carried out. More often the Ombudsman will recommend that the authority pays in recognition of loss of amenity arising from the development.
Thank you. That's fine. There are clear documents publicly available online which show they did not, for some reason, write to myself or the previous owners, although they wrote to all other surrounding addresses.