hmm well my advice would be to grow some of those things in pots if you can! That will save space in the beds for the things that really need it. For example your herbs,, your courgette and maybe teh sweet peppers.
For the root veg I have always believed that they are better sown straight into the ground - why not try a short row of each and not very widely spaced, just means you will need to hand weed.
Lettuce will grow with slow growers.
2 green beans won't give you much!! But beans can be squashed up quite a bit in my experience. a square metre will give you a good harvest.
Save space by planting your sprouts and broccoli and squash on the edge of the beds then they can trail/poke over the sides a bit.
Remember too that some things will not work/be eaten/be damaged so try not to be too stingy in your counting!
good luck.
