A 1100 range cooker is a serious object
It is not a cooker, it is a piece of furniture. Stand it in the gap and find out whether the gap is really 1100.
Choose a size
Drag to walk round it
Opens your camera. Point it at the floor.
Once it appears: one finger drags it, two fingers turn it. It does not need a clear floor. Drop it where it fits and judge the size against what is already there.
Will it go in the gap?
Range cookers need air either side and a real extractor above. Neither is optional.
Let them scan it and hold their own phone up
The camera view only works on a phone. Point the code at their camera, and this page opens on their handset. That is the moment the idea sells itself.
Appliance dimensions are nominal; check the specific model before ordering units. Clearances to combustible surfaces, extraction rates and ventilation requirements are set by the manufacturer and by Building Regulations Approved Documents F and J. Gas connection must be carried out by a Gas Safe registered engineer.