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If your kitchen has a back door leading to a garden then it would need an RCD protecting any sockets that are likely to be used for the garden.
Having been brought up in a home with fuse wire I always use an extension lead with an RCD on the plug. Which also means it gets tested every use. Hands up everyone that tested their consumer unit RCD in the last 3 months...
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It's also pretty common for trades to assume they are covered by an rcd without even checking. Especially dangerous if you're outside on scaffolding or cutting stuff in the back garden. It's one reason I've heard given for the popularity of battery powered tools, less hassle on site and no 110/240v decisions.
If your kitchen has a back door leading to a garden then it would need an RCD protecting any sockets that are likely to be used for the garden.
It does seem a bit jobsworth but RCD's can save lives and asking them if it's avoidable probably got their back up. Not really your fault if you're trying to save money but they might have felt they were wasting their time at that point.