I have a vague idea of what I'm going to do about 1 to 2 weeks in advance, depending on what I've bought at the butchers at the weekend and picked up at Sainsbury's. Then I hit Lidl for the things that are cheaper there, and the meals shape up.
I like to have alternatives, just in case something doesn't thaw out in time, or someone has eaten something I planned to use (with a husband & two teenagers at home, that happens quite a bit!).
Like last night I had turkey steaks. But no idea what I was going do with them - Greek marinade and rice, or cream sauce with veggies and egg noodles. It's nice to have a choice.
Before Christmas, I did something the kids & hubby loved. I planned menus based on what I had in the house, but not what day they would be on. And I Google'd images of those meals (bangers & mash, fish & chips, enchiladas, hoi sin wraps & stir fry, etc) and printed them out with the meal described next to them, like it was a menu in a diner. I put it on the fridge. They loved it, and they kept away from things I'd be using in meals. Plus it was easier if my husband had to start meals for me because of late trains.
I plan on starting doing that again soon!