Hob and oven single supply cable

[Midwest]

3) I've never come across an 3kw appliance with a BS1363 plug, but if you have then I'm prepared to be convinced. And some ovens come with a connecting cable, some don't (mostly those requiring 4mm& above).
4) Appendix 15 refers to connecting 2kw appliances to ring final circuits (page 453 BYB). You can connect more than one appliance to one circuit, so long as it is designed correctly.
5) Yes

 

[davesparks]

3) I've never come across an 3kw appliance with a BS1363 plug, but if you have then I'm prepared to be convinced.

Not sure if they still do them but screwfix used to sell a 3kW Stanley industrial looking fan heater with a moulded 13A plug on it.
I've replaced a few sockets for a customer who bought a job lot of them.

 

[Midwest]

Blimey, plug a few of those into your ring will get the cables humming!

 

[davesparks]

Yes it did!
With everything else they had in the building they got L1 up to ~125A on a 100A service (L2 ~40A, L3 ~20A)