Hey dude, welcome.
Re the organic meat: It's optimal, but not essential, obviously local, organic, raised on permant pasture with not agro-chemicals is the most ethical and has the least impact on the planet, however I'm poor so Aldi it is for me. UK meat is not as bad US meat, go out into fields arround Bristol, you'll see cows and sheep eating grass. Pigs still eat crap, and chickens are meant to eat some grain but not a diet based entirly on it.
If it's an ethical thing then you have to make that decide what to do, eggs have plenty of protein, cheese, nuts and greek yogert also have some if you are tolerant of dairy and not trying to lose body fat then eat these too. IMO lentils are the least offensive of legumes, they don't need soaking so are farirly digestable, you could bulk out mince meals with lentils (red for tomato dishes, green for things like cottage pie)
Drinking till you fall down is never optimal, but it's your life, there isn't a special 'primal club' where you have to follow the rules to the letter or you'll be ex-communicated. I don't think a few rum and cokes, the odd pint of local cider is going to do you massive harm in the grand scheme of things. Just don't go into Yates and drink 13 pints of Carling (only cos that makes you a townie muppet)
I don't really do hot lunches that often, but when I do they are not any differnt from tea, I pretty much never eat breakfast anymore, so lunch is sometimes bacon and eggs, sometime cold meat (usally cook up a whole chicken, better than processed crap), Home made soup. tinned fish, eggs, liver curry. There are tonnes of paleo blogs on the web that are mainly recipies for insperation.
You know all those pictures of Adam and Eve where they have belly button? Think about it..................... take as long as you need........................