OK, on the 4th line terminal. I've not yet seen that approach used anywhere.
Some older-model British cookers were clearly made in both domestic and export versions. They typically used bolt terminals for the incoming cables, fitted to which were the appropriate number of quarter-inch lugs onto which the internal wiring terminated.
The domestic versions just had a single line terminal with all the feeds to the thermostats connected to it, but there were vacant L2 and L3 positions on the chassis where extra terminals were fitted for export versions -- The feeds would then be connected to balance out the load.
The free-standing all-in-one cooker was the norm for many years, and these are considered fixed appliances here too, and are generally wired with standard "twin & earth" cable.
Separate ovens and hobs have become more fashionable in recent years, and as Dave has said for Ireland, they do seem to be problematical for DIYers. A single isolation switch can control both here, so long as it is within 2m of both units.
