I've noticed my fellow britbongs complaining about how we're doomed and shit like that when the SHTF happens.
What you need for the happening.
Strength.Work out, start running. start learning some sort of martial art, do military exercises. For mental strength start meditating, it may sound like hippy shit but it's good for you.
Weapons.
You can order swords, axes, knives and machetes, crossbows and bows off the internet and buy them in shops. You can also buy any form of armour you want.
I reccomend a good quality military knife, a military flak jacket (melee weapons will be more common here than guns when the SHTF, and flak jackets can be bought for like £60 off surplus stores), a good machete, axe, or sword (has to be good quality) and a crossbow. Get a bow if you practice with it (like I do.)
Also, if you can, get a shotgun licence. They're not too difficult to get, and if the martial law police are coming, hide them under your floorboards. You can get illegal firearms, although I've never had one and I'm not saying you should buy one.
Learn survival skills. Learn to make shelter, hunt, forage, etc. There's plenty of nice forests here if you know where to find them and nobody gives a shit if you're camping in an isolated location.
Also, I reccomend moving to the countryside. The countryside is 100% white, most people own firearms and people are tightly knit. Chances are most city dwellers and shitskins won't reach the countryside, they'll die of starvation, from other people, the cold or bombing and disease.
If you have a good house then store food, more weapons, ammunition, traps, candles, everything you need.
Also get a group of fellow nationalists to survive with you.
I'll answer any questions you guys have.