Potentially stupid 10 Amp Hook Up question

[166 MM Barchetta]

I, sorry, my friend, has finally got his wife to agree to go camping as we’ve never tried it for a short break, I’ve not been in a tent since I was a kid, but I fancied trying it in my senior years.
The question I have is, I’ve found several campsites with electrical hook up but they are 10amp, most mention “within 25m” of pitch but I’m struggling to find a 10amp that long.
Can I use a higher amp 25m cable but obviously stay within the 10amp limit, my friends wife has agreed so long as she can charge her phone and we can have a small camping fridge which I think will fall well within 10amps.
If it’s a stupid question then I’m asking for a friend………..

Said friend would also like to know anyone’s reviews of Dwyros campsite near Aberdaron as that’s caught his eye.

Thanks