Without better data, allow a couple of KW per ring. - so 4 ring hob might be 8KW.
Now thats about 32 A, however, in practive the thermostatic controls will not normally have them all on at once for long enough to cause problems, and I have seen such a hob that had worked for a number of years of a 13A plug without incident, but it is customary to have at least a 30A supply for a cooker and oven, sometimes 40A depends on the oven.. THe supply comes from a dedicated fuse or circuit breaker, direct from the consumer unit.
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