I can’t really help or add anything that’s already been said and I believe you will be in excellent hands with Ebizeds advise.
However, I do feel your pain.... I’ve just been through something similar as far as a junior Planning officer refusing a perfectly acceptable application which has been approved on a similar propert around the corner. Essentially they wanted me to move back the front of the second storey back to avoid a terracing effect and wouldn’t accept a compromise which would mean we kept an en-suite in the plan.
Spoke ke to my architect and asked why I couldn’t build forward of the building line to avoid the same effect. I’m building on top of an existing garage which sits proud of the front of the house already so why not....
i gathered evidence of where both both styles had been approved locally with street view images and links to the Planning submission.... they then accepted the original compromise.
Now on to the next stage.... finding a builder and paying for the thing
good luck, exciting times mate.