Just bought this Masterplan Country Mansion for £2.99 plus postage on Ebay:
I couldn't resist. Especially with that gold Roller sitting outside. Every other episode of The Professionals was filmed at a country house like this. It was the home of an industrialist who was funding a coup, a family that was kidnapped, a diplomat's country residence - etc etc - if Bodie and Doyle weren't storming the place, they were defending it, turning it over, rescuing the occupants or guarding them.
The Masterplan buildings are made simply from coloured card and wood. You can assemble them in their basic form in minutes and have plenty of potential for adding additional detailing if you wish. But at least you have a basic shell that's table ready.