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You get a cable with the car that has a UK 3-pin and then the car connector (i.e. Type 2 or something). This is probably what... 2.5m in length? 5m?
And then you've purchased an extension to get the UK 3-pin even further... extending another distance so you can make this work.
The thick cable that charges the car... this is good.
The extension cable to provide length... this is not good.
What I've learned is that the charging cable to charge from the mains shouldn't ever be used with an extension.
What intelligent switching exists within the cable unit, it doesn't work when connected to a cable not capable of sustaining the load (and every spark I chatted to on a few forums all agreed 2.5mm is the minimum for 2.7-3kw)... the result is the cable and car draws max voltage and the chances of bad things happening are a lot higher.
Use the cable you have... don't run an extension.