"Tony Gent" wrote | Thanks for all your advice. I think I will put in a second side door | and block the up n over door form the inside. | What nobody knows wont hurt um eh.
You'll need Building Regs approval for the new opening for the side door.
You could replace the up and over door with a pair of timber side-hung doors, draughtproofed and well insulated but still openable for getting big stuff in and out, and have a small door inset into one of the big doors for pedestrian access.
Owain