How best to wire in new oven/hob

You can have both off of 32 amp mcb ensuring that the cable is 6mm t&e and backed up by an RCD. After applying diversity to this you can have up to 15 kw of load as the appliances are thermostatically controlled they are deemed not to be on full tilt all the time.

In theory you could have them both on a 32A MCB assuming the 6mm t&e is clipped direct & RCD protected. Depending on the length of the run you can apply diversity to this however as they are not running at 100% permanently. I would have put them on separate circuits to future proof things however it looks as though this is not the case. I suggest putting the oven on a 2.5mm spur off of the kitchen ring with a switched fuse connection unit (13A), you could terminate the spur into a cooker connection unit to complete the job nicely. Connect the 6mm into a cooker switch, again 6mm to a cooker connection unit and wire the hob into that. That way you have isolation for both appliances independently. Ensure the spur and cooker switch is 300mm away from the hob. Hope this helps!

Deacon is absolutely correct. And you shouldn’t fit anything permanently to the ring over 2 Kw so put them both in the cooker circuit

On a 32amp supply you can only have 7.6kw so if the loading of your appliances exceed this amount the supply cable will need to be upgraded to 10mm so check the loading demands of the appliance on silver label usually on the side or the back of appliance hope this has helped