All in one electric cookers

Your recollection of basic electrical theory is correct but a more important question is the desirability of disadvantaging the many vanners who stay partially or wholly off EHU. from a manufacturers and second hand market perspective, eliminating gas for coking will inevitably reduce potential sales. Personally I'd be happy to swap my slow solid electric ring for gas. which would cost very little extra to run. There's a "but" though - for the fourth ring to be induction I'd pay more. I doubt that it'll catch on though because people would need induction friendly saucepans.

Agree with this.  I've always been a fan of a gas hob and hated electric rings but I now prefer induction to the lot.  I tested my caravan pans with a magnet and struck lucky.

Most of our cooking is on the cobb or the remoska but I occasionally take my single ring induction hob with me

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They look to be 1300 watts which is approx 6amps.  This should be ok providing the site supplies 10amps or more.  You might need to be carefukl what you use at the same time as this though to be on the safe side.

If it is an oven/grill with 2 rings on top, it will be a lot more than 1300 watts.

We have the Lidl oven/grill, it is 1300 w on its own, then we have a separate 2 ring hotplate, it can use a total of 2100 watts.

I would check the wattage carefully before buying OP, or you may be disappointed if you plan to use only that for cooking.  Some of the combined units are 3000watts total.

We do use the electric oven a lot, but mainly the gas rings these days.

Personally I'd be happy to swap my slow solid electric ring for gas. which would cost very little extra to run. 

I like the electric ring for certain things. For instance in colder weather when the nights draw in I may occasionally make a casserole on top of the stove. I use heavy, thick bottomed stainless steel pans but even so wind it difficult to achieve a gentle simmer on gas.

Kjell the kitchen M8 that the OP is looking at is an all in one cooker and not a combined oven/grill. 

Ah, an electric cooking pot?

It was the phrase "electric cooker" that confused me!

Should have asked OH!

Dave, fully electric? Hookup prison? Really?? You mention cost saving. And ' eating away at the gas' Firstly, have you heard of Safefill? A quarter of the price of cylinder swap gas and as far as electric hook up is concerned- have you ever considered non EHU caravanning? If you take the trouble to read the thread " how to survive a non 240 site" I think you will get an awful lot out of it and it will hopefully give you a new perspective. The new technologies have brought with them a golden opportunity for us to slash and I mean SLASH costs with no reduction in comfort levels. To tie yourself to an EHU is in my opinion a backward step. A non EHU holiday last year for 15 days cost me £60 + the Safefill gas I used which was about a tenner. What's not to like? Good luck mate.

Our caravan cooker has one electric hob, three gas hobs, a gas grill and a gas oven. We also have a two burner electric hob in the awning.

weve got an electric wok with lid - don't use gas anymore

Due to a miscalculation (error) on my part, we ran out of gas on the final week of our recent 3 weeks in Ireland. Survived by using our small Cadac Carry Chef, charcoal BBQ, but bought a single ring electric hob ( about 30 euro from Argos) pulls about 6amps fine if used sensibly. Of cause I got called all the names under the sun as we ran out half way through SWMBO cooking her morning porridge.