Ghost has been doing some more floorcraft experiments, because he cares a lot about keeping his followers safe and wants to figure out how to do it successfully in London - what works? If you've ever tried it, you'll know that it's not obvious, especially if you either don't have much experience at all or you don't have much experience of how it works anywhere else.
First, swordcraft, or a martial-arts perspective on keeping your distance:
The answer is if you're holding a 41" sword (the unfortunately-named hand and a half or b******* sword) in your right hand (bearing in mind the follower restricts how high you can lift you arm with her embrace) the leader in front of you should be *just* outside the range where you could hit him without taking a step. ie about 5 feet .... Just to clarify, 5 feet from leader to leader not 5 feet between couples. I reckon the woman takes up about 2 feet ...And secondly, why it's a good idea to use the corners and hug the side, and how to do these things successfully so that someone tailgating you stops being a problem - or at any rate, stops being your problem:
Both posts have drawings to explain why these things work, so definitely look if you like to learn visually.
When you come to a corner, go right into it. You're safe there. Now for the Killbox - as you exit the corner, that's when you're vulnerable. ... Fortunately even in close embrace you'll always be able to see to your left.
Many people whose social dancing I respect a lot, give similar advice (if in metres or paces rather than feet or swords-lengths), so there's good reason to expect it to work. Also, I've tested some it myself in a class where I was required to lead, and I managed not to have any bumps, so it works pretty well even with minimal leading skills.
But the more people do it, and know how to do it, the more effective this stuff gets.