The UK needs to STOP growing! (Out the EU I say)

I think he's operating under the assumption that hydro-electric technology allows you to generate significant amounts of power by putting turbines anywhere in the sea at random, rather than somewhere which would actually have a lot of flowing water.

Examples of flowing water,
Humber estuary (mouth of river) (4 miles) Lots of river feeds, thames estuary (28 miles wide clacton to opposite) lots of river feeds,

Many others could also be suitable with enough flow.

food is something that we need to survive 100% of a need, which is why we need 100% control of it.

Which'll perhaps make a dent in our energy requirements, something that'll likely be compensated for by the machines we'll apparently be relying on within the next few decades to replace all those EU migrant workers.

But we don't live caves any more. If you are looking to protect just this country, your best bet would be to simply massacre about 75% of the population and go back to a subsistence culture where people work the land by hand. Obviously, we wouldn't be able to work the land mechanically, because in a self sufficient land, where would we get machinery from?

Which is why these projects are important.

So once the landscape of our geographically small country is dotted with wind farms, hydroelectric power plants and solar panels, where do we get our food from again? Because reading back a few pages the Maoism thing will not fly-British people will not uproot to go work on a farm (in significant enough numbers, anyway) and the government will not redistribute the crops once they're grown. I'm vaguely socialist myself, but that's not going to happen.

Let me make clear:

Hydro does not take up land it takes up water. Wind farms can be placed offshore or on land that is unsuitable, moor land as an example. Solar on roofs. We don't need to take up so much land as people think.

this stuff won't happen today, this is more of a plan for the future and the problems we may face with food security in the coming decades.

None of those power sources will provide enough energy, to say nothing about the environmental cost. And the food plan wouldn't work regardless. Nobody's going to feel like living in a rural commune in 10-20 years time.

No one would really need to. Just farmers and construction workers temporary. Combined i'm sure these methods of power generation would provide the UK enough electricity. If solar panels can provide 1 house enough electricity and feed electricity to the grid alone solar panels could do quite well. But with the other methods we would be somewhere along hitting our demands for electricity all renewable.

The only way that people would willingly uproot to leave cities and towns to go work in the fields en masse would be if it were necessitated by some kind of recession (I wonder what looming referendum could cause that?) in an attempt to increase (or even reach full) employment. That's a fairly radical social policy, which I'd guess would be advertised as a temporary measure, but food is a continuous requirement of any nation. How would this work in the long term?

I said far earlier on in some previous posts that we won't need people, machines can pick crops with self driving vehicles becoming so close it won't be long before jobs start becoming more automated and humans won't have to work.

This will allow humans more time to work on large scale projects related with global warming and other things that are of large need.

Combined i'm sure these methods of power generation would provide the UK enough electricity.

You would make an excellent politician. Being sure of something is far more powerful and correct than something based on evidence, science or basic fact.

Just out of curiosity, where does the electricity come from on windless nights during slack tide?

The OP does remind me of all the failed policies of communist China when all the clever people were made to work on farms but being useless at farming, all the farmers hated them because they ate scarce food but couldn't do any work.

Well it will all be self driving machines picking and planting, picture shown some good few posts ago.

We are coming to a point where robots can do loads of our jobs. You could probably have robot's running a store today.

In which case, what happens to all the vast numbers of jobless idle human beings that populate the country? Because they aren't suddenly going to be given things for free. Even if we ARE "coming to a point where robots can do loads of our jobs" we aren't coming to a point where large scale socialism is regarded favourably, either by the electorate or the majority of senior politicians.

Here's some reading material for the OP regarding total self-sufficiency.

https://en.wikipedia.org/wiki/Juche

This thread's so absurd it's entertaining.