A concrete garden is a pretty intelligent thing. I often think about to asphalt my 1000 square meters and to coulour it green. ..
You could buy a tripod barbeque grill with firepit like the Landmann grill.
https://www.amazon.co.uk/Landmann-Ltd-543-Charcoal-Barbecue/dp/B0002DF1UO
Or you make it yourself somehow, three bricks, a flat large bowl or a cutted old fuel or food oil barrel or something similar and a wooden tripod over it.
And than you could start cooking with that.
Probably not the most comfortable way to do it the next three month, but a nice project for the next spring.
Additional the 1,5 litres containing 12 cm Zebra Billy can would be a good option as a camping pot, because the very common 230g gas tins with screw ventile fit perfectly in, so you would have a good pot for the use in your "garden" which is very usefull for outdoor adventures and as a survival item as well.
That should be large enough to cook some pasta for two persons.
Different to my recommendations for trekking pots in the video thread this pot can be stored outside without smelling inside or get destroyed outside by corrosion like an aluminium pot.
It isn't as light as titanium or aluminium pots but a very common pot for bushcraft too. And in the rucksack it is portable as well.
Another thing that you could start to learn immediately would be to learn the knots which I picked up in the video thread.
That is something very usefull outdoors, but a nice project for the next month inside.
The first of April you will know them all and surely will be able to tie them with closed eyes.
Next summer you should start to sleep in your garden. Try to get a used original military field bed like this here:
https://www.genuinearmysurplus.co.u...-Super-Grade-British-Army-Camp-Beds-p80846628
You should construct an open shelter over it and heat it with the fire pit.
A simple thicker Evazote mat you have to put on the bed because if not you would get a cold back. Take that and nothing else, because you can use it later for camping and bushcraft too.
The best deal would be if you buy a used army mat.
For use next to your house you can buy a warm used army sleeping bag. The best would be a used complete britisch army or Carinthia german Army two bag sleep system.
Because often the fibres of the filling are broken they aren't recommended for trekking and hiking, because they loose ability to keep you warm, but don't loose weight.
For hiking that is ineffective, heavy and bulky.
But they are absolutly OK for such a use, for boats, cottages and camping out of the car. And you can get such stuff very cheap.
Which are the currently in Britain used available best options I can't tell you because I don't know British army surplus stuff. I am a German and we usually get mainly German stuff here. But as you can see here such stuff is cheap.
http://www.endicotts.co.uk/catalog/sleeping-bags-0
There are a lot of other military surplus shops in Britain. If you want to do that, you have to ask in the forum what would be the best option for you.
The members of that forum are playing regularly around at such homepages and are surely pretty well informed what's going on.
So you would create a nice survival camp in your concrete garden and could start camping outside.
If it becomes unpleasant you just go into your house and in your bed.
If it doesn't become unpleasant, what I expect, you are ready and well equipped to look for the guys of this forum at the next meeting.
Should you come to the conclusion, that all that was an idiotic idea you can sell the army bed and the surplus military sleep system for round about the same price you payed for it, via e-bay or in this forum.
That wouldn't work, if you buy new stuff.