Great question Scooby.
Yes on the face of it the recipe has no bearing on the original DL amazing Mild, this was my first go at it:
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Before I had even brewed a mild I had done a fair amount of reading, CBA website, here on Jims, and David Sutulas Mild ale from the Classic beer series. And from what I can gather a mild is born out of the percentages of the grist, and DLAM is spot on(it also means I don't need to get my notepad out and work out different sugar additions).
The amber found its way in if I remember to slightly compensate for the use of Nottingham and I had some that needed using up, also I had seen it mentioned in many good recipes too. It does add a certain something to a mild too, so its a keeper.
So this mild was my first dark beer and in the interest of learning, I decided that I would split the roast barley and Chocolate on the recipe, at the end of the day it was a suck it and see(but informed by what I had read up on). The torrified wheat/wheat malt is there just for a bit of head retention. I have played around with this recipe but I have maintained the ratio pale/dark/sugar though I see that there is scope to use this as a learning platform to manipulate the dark malt mix.
The hoping is born out of what was in my stores as I can't just get something in for the following day. Though I work on the notion that you want for this style of mild to keep the IBU under 20ish and you are looking to add flavour more than bitering(hence FWH, or getting as much from your hops), and so far I have only used challenger, goldings, and BX in varying combos, which will be described as Classic British hops. I think as long as the flavour a hop brings will work with your grist(which my first year of brewing, I had being getting my head round hop flavour).
All I have done is apply what I have learnt and then applied this information to a recipe that is spot on. Its much like cooking when use a good recipe as a base to then experiment with. The key is a good base recipe.
through the power of osmosis I think I have picked up quite a good ratio of information on recipes, and the courage to experiement.

Also I have never really wanted to copy commercial beers, I have just want good beer in the house, and get better at brewing every time the copper comes out.

Still so much to learn to feel confident