You might need to speak to a planning consultant, because this looks to me like the planning department have reasonable grounds to argue there is a breach.....you might need to start looking at compari g costs of fighting this with costs of redoing brickwork.
Unfortunately you only partially changed the brickwork, so some of the previous still exists.
You've use a multicoloured face brick which I would guess doesn't match the very original brick on the house nor the rest of the street.
When you changed the Facebook before the extension was started....was that actually permitted development - I don't know.
There is a fashion for houses being clad or rendered these days - I think that's PD, so maybe changing brick is too.
Unfortunately you only partially changed the brickwork, so some of the previous still exists.
You've use a multicoloured face brick which I would guess doesn't match the very original brick on the house nor the rest of the street.
When you changed the Facebook before the extension was started....was that actually permitted development - I don't know.
There is a fashion for houses being clad or rendered these days - I think that's PD, so maybe changing brick is too.