That might be even more difficult than finding someone to do it in the first place and if it needs rework then more expense.
Current standards for appliances under worktops is straight forward, each appliance should have a FCU behind it under the worktop, this goes to a switch above the worktop so as that appliance can be turned off easily. Now one problem is that plugs are moulded onto the appliances cable and cutting them off to connect to a FCU might invalidate warranty so often a single outlet socket is used instead but these require extra space due to the plug.
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Above the worktop you have two pole switches , one for each appliance that are under the worktop which can be supplied by the same circuit, be it an old ring or a radial. You can get these with labels as shown below.
View attachment 192422With a new install some people don't like these switches dotted around their kitchen and opt for a single grid switch panel with them all in that is out the way but again labeled switches are available.
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