I use a 25m camping extension lead with built-in RCD, rated at 16 amps. No problems with granny charger when in use. Only snag is it has a commando plug but a short adapter to 3 pin plug works fine without getting particularly warm. We already had it but easily available at camping shops.
I have an extension lead designed for camping. It has a blue site plug attached (to use on French campsites).
The cable is rated to 16 amps, has a RCD and is 25metres long. I have a blue plug adapter to UK three pin 13 amp socket.
I have not used it yet as an extension to the granny charger but...
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