Roger Hayter wrote:

If the hob is wired with suitable cable/flex for 45A *and* the makers
of the hob specify that a 45A supply is ok you could use a standard
cooker switch (which would be useful if you ever put an oven in),
otherwise same as above.

The hob is specified as 230V 2900W and is fitted with what appears to be a
standard flexible 3-core cable. It came from a previous kitchen where, as I
recall, it was plugged into an ordinary 32A socket located behind the
cabinet. I was intending to use a conventional cooker switch with 2.5mm
cable to a cooker connector and the hob's own cable thereafter.