So are you expecting very high protective conductor currents from this cooker? To the extent that the cpc normally considered adequate in 10mm² T/E would not be sufficient?
To answer you shortly BAS, yes and no!
*this is a bit off the topic of this tread, but I love your comments, so hopefully you will take the bate*
I belive the BS wiring standards are now lagging far behind rest of Europe, i.e. DIN standards. This goes for earthing, no "neutral"- MCBs / "common neutrals" (i.e. the challenges with borrowed neutral) and the lovely ring circuits! (copper isn't that expensive post-1930s so in my opinion rings should be illegal, and MCBs with N+L switching isn't much more expensive than a single L MCB any longer, nor do they take up more space in the CU) It is of course absolutely fine in UK and Ireland (we follow you guys) to use T&E's earth lead for earthing appliances (in most cases, even this cooker installation), but personally I would like to see some changes to the BS. I would like the same sqmms for the "lives" (L+N) as for the earth, why- because you don't want to increase the resistance of electrons flowing from L or N to PE by reducing the earths sqmm relatively to L+Ns sqmm. I am sure you have seen that in some circumstances T&E 1.5mm2 cores come with a 1.0mm2 earth core. (This you could find in cable sold by some of the beloved sheds, and these cables again in my opinion should never been BS certified).
Now lets get back to what kills people electrical wise. It is of course not voltage (in low voltage systems anyway, contradicting some of the comments posted on other treads in this forum), but current. A 45A appliance as the cocker, will theoretically draw up to 45A before the 45A MCB will say thats enough, and even then, you will find your N to now be "L" and without a MCB protection at all. If it was a short in this cooker, and let say, my body made a better connection path to earth than the PE core (I might have been wet after a shower, I might have been without slippers, and the kitchen might have been on ground floor) well, then I would probably have been on my way to to join the harp gang (AC>100mA-or DC>300mA through the heart will get me there), and I wouldn't have been to much happy with the installed cable. Other words, I would treat all high kW/ VA rated fixtures with respect, and install earth cores same size as L and N or larger to minimize the resistance in the cable itself. Also of course RCDs and SPDs should be used, in all installations.
Ps. I would also like to see proper earth rings to be used around residential homes (and sheds) and not a silly copper stick drilled to the ground Ds.