Don't adapt the caravan lead, just get a normal UK extension lead (3 gang) and chop the plug off. The local DIY store should stock a plug which fits the caravan lead, just wire it in.
We were in Lake Garda in the middle of May and there were hardly any Dutch there compared to previous years. There were the usual sprinkling of Brits, however.
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.........too late for the OP but if you intend to use an electrical supply in a tent you should recognise the dangers and get a purpose built supply lead that has overload and earth leakage protection.