Peter Stockdale wrote:
... the best way to lower the cooker socket.

It depends on the directional source of the power input.
If the socket is sourced from a vertical wiring from floor level - then
its simply a matter of chop and refix.
If the socket is sourced by horizontal wiring or from the ceiling, a rewire
back to fuse box advisable and is the job for a competent electrician.
Regards
Pete
www.thecanalshop.com

As Pete says, the job's an easy one if dropping means using less of
the existing cable. You've said very little about why you want the
cooker "socket" lower. Do you mean the cooker control panel, or the
cooker connector unit into which the cable from the cooker goes? If it's
only that part you want to move down, and the cooker control unit's not
far away, there's a separate bit of meaty cable running from the control
unit to the outlet, which won't be hard to rip out and replace with a
new, longer bit. Other ways in which you could be lucky: will the old
location be covered over inaccessibly (e.g. with tiles)? If not - even
if it's in the back of a new base unit or wall unit which you could
create a simple access hatch in - then you can use a seriously meaty way
of joining the old cable to the new length (oddly enough, a cooker
connection unit is a widely-available way of getting a 45A-rated 3-way
junction box: do NOT use an ordinary 20A (lighting) or 30A (power)
junction box, it will NOT take kindly to the higher current a
freestanding cooker will sometimes pull). Nor can we tell if it's OK for
you to run any new length of cable on the surface (easy) or if you have
to chase it into the wall (harder, though far from impossible).

If you want a helpful answer, it's worth filling in these details -
otherwise you get the "crowbar", "teleportation", and other "ask a silly
question, get ..." answers!

Cheers, Stefek