John wrote:
Might buy a new gas hob. Can anyone advise if the size of most 4 burner hobs
need the same size aperture?

Mine existing opening is 560 wide (L to R) and 475 front to back.

Will do a search of specs - but on many of the retailers sites this
dimension is not given.

I had an AEG one fitted not long ago the cutout was specified as 550 x
470, if that's any help.

David