These radiator shelves are made to order by an independent Joinery company in the heart of the Midlands.
To allow for the curved corners I recommend ordering the next size up from your radiator for example if your radiator is 1000mm order the 1100mm shelf.
I would recommend a gap of 18-40mm between the wall and the radiator for the enclosed brackets to work. Other options are available so do message us if yours do not fall within those dimensions.
Supplied with brackets which are extremely easy to fit by just screwing them to the underside of the shelf and then slotting them down the back of the radiator. (fits most radiators either by slotting into the loops on back of radiator or slots between wall and radiator which keeps it in place)
Shelves are 18mm thick.