has the right idea. Self defence works the same way regardless of where you are. I like to think of it as having three layers:
This is stuff everyone on the planet should be doing. The fact that it's stopped being common sense is because white people made their countries so safe for a while, but we all know how that's going. Don't go out at night if you can help it. Stay in groups. Get lifts if you can. Drink responsibly. Know where the nice parts of town are, and stay in them. Stay in well-lit areas, in full view of enough people that it's unlikely all of them could be muggers' accomplices. Keep your fucking eyes open. This stuff is so simple but it prevents the vast majority of incidents. Don't forget it just because you're a big guy. Remember: the winner in a knife fight is the one who dies in hospital. Of course, even if you're being safe, things are still going to happen, which is why we have the next layers.
Honourable mention here goes to body armour - it's not exactly common sense, but there's really no reason not to wear whatever protection is feasibly available in your jurisdiction. Armour's allowed in the UK, so get it if you can afford it and if it's appropriate for your circumstances. Walking around in a plate carrier loaded up with level IV plates might raise some eyebrows, but a concealable stab vest might save your life.
This is when you can see the problem, and you are going to have to deal with it one way or another. Running away doesn't make you a coward in a self defence situation, do it if you can. If you can't, you can try some of that fancy 'verbal de-escalation', or attempt to intimidate your opponent, but the fact is that if they're starting on you, they already think your wallet or your arsehole is worth the fight. This is why the third part of self defence exists.
Sometimes, you're never going to avoid a fight. UK law is set up to completely fuck you in the arse if the judge has reason to dislike you, so try and keep your power level hidden if you're expecting an incident. No reason to give them more ammo because you're one of them nadsees. Same applies to your interactions with police and judiciary. Don't make yourself the bad guy. Look respectable, co-operate and be polite.
As for actually defending yourself, your only option in the UK is a martial art. Tasers, pepper spray, mace, all defensive weapons are right out. Absolutely anything you carry can be used against you unless you have a very good excuse for carrying it - the police have the jurisdiction to declare whatever the fuck they like an 'offensive weapon' because they have that ever-Jewish 'reason to suspect' you're intending to use it to bash someone's head in. That means knives, twigs, pennies - I've even heard stories of people get into fights completely unarmed and get done for assault with an offensive weapon because they knew karate. Some self-defence experts recommend you carry a powerful torch or flashlight to blind your opponent - I don't think they're illegal here, but they are in some countries, and as stated the judiciary have the power to fuck you whenever they like. It's a system that works wonderfully in a high-trust white society, but is wholly inadequate for modern day diversified cities.
Short of moving to a better country, the best advice I can give in a fight is swing first. If you know a fight is coming, you need to win it. No honour bullshit here.
Of course Brixton's still bad, it's the Chicago of London. It's where all the niggers live, and has been since they came here. It's only 40% white British - 15% other white, 25% black. Pic related, from the pie chart generator at ukcensusdata.com/a-e09000022/b-qs201ew