OP
Ian-LS
agree with the comments above.
You should still check with the local planning officer that the area is not in a conservation area. If it is then permitted development is overruled and you need to apply for full planning. If it is then check with them what type of drawings and illustrations they want of the positioning of the panels as some want proper design drawings which you may need to get someone to do.
Not true, planning permission is not required in conservation areas except for wall mounted arrays.
" in the case of land within a conservation area or which is a World Heritage Site, the solar PV or solar thermal equipment would be installed on a wall which fronts a highway; "
The Town and Country Planning (General Permitted Development) (Amendment) (England) Order 2011
Councils can apply for an article 4 to remove permitted development rights
"Permitted Development Rights withdrawn
You should also note that the local planning authority may have removed some of your permitted development rights by issuing an Article 4 direction. This will mean that you have to submit a planning application for work which normally does not need one. " Planning Portal - Permitted Development Rights
So only if an article 4 has been applied to a conservation area would planning permission be needed.