Ha! These posts need a whopping big disclaimer on them to the OP to say that we are now the biggest hypocrites in the land!!!

We are discussing precisely what we said you should never do!!!
Interesting post
@Nitefly , you make some interesting points.
Current gear: Gibson Les Paul Standard 2018 (blueberry burst), Marshall DSL40C. By no means 4x12 cabinet, but I don't need that for what I do, and to be honest, I don't need a 40W valve amp either! It knocks down walls if you turn it up! Pedals: Boss DD7, Big Muff Pi, CS-3, TC Corona chorus, Boss GE-7, Mr Black Supermoon, Boss CS-3, a RAT, TC Golden Plexi - I know, I already have a Marshall but I was curious for just a few quid! a Bad Monkey and the Dane.
This is the lesson to learn about chasing tones and why its a bad idea:
I love Dan's tone in particular, hearing his guitar on its own is just a super rhythm tone. Justin has a creamier and more "Les Paul Custom" kind of sound.
I heard Justin used to use a ProCo RAT. So I bought a ProCo RAT. Can confirm, it just doesn't work with a Marshall amp. Like, not even slightly. I tried using it just on the clean channel and the OD channel and it just doesn't work. £130 of wastage.
I can get quite close to that Black Shuck kind of tone with my amp alone. I sometimes use the Boss EQ, but mostly for the level boost - keeping the EQs fairly flat. Using a Muff just muds everything, that's a useless pedal for the Darkness, but I didn't buy it for that reason.
The Bad Monkey on the other hand, it was fairly cheap at the time but its absolutely fantastic. Love it, gets a little closer to the creamier more overdriven tone of Justin's guitar. Its a superb pedal for the money.
Interesting your comments about the EQ and scooping a couple of the frequencies. I usually just resort to my amps EQ, but occasionally, given the limits of my amp, I often find myself turning the dials up quite a long way. You are spot on about the gain though, less is definitely more, particularly for Dan's tone, and just use your playing style to make is sound nastier! Most of the time my gain is only on around 10-11 o clock.
9s strings for solos, 10s for rhythm. I play 10s most of the time though....
You are right about the "mix" with the various band components, you can never really get close, plus all the post production tweaks, and the multi-tracking as you've said, you can never get it that close.
As an aside, there is a lot to say about the Darkness. They get a lot of stick and are kinda seen as a bit of a joke now, but they are massively underrated guitarists (maybe they aren't amongst guitarist circles....?). But their last 3 albums have been absolutely top notch stuff with some great guitar work and catchy riffs.