Hi,
I put south in there to show I grow in rows north to south so the rows get equal sun.
The Onions are to the west of the Carrots which due to the prevailing wind, the Onions should distract Carrot Fly - I do put a mesh around the Carrots as well though (Carrot Fly come in horizontal).
The other way round, Carrots help to reduce Onion Fly.
I grow the Beetroot between the Runner Beans. The Beetroot grows pretty well before the Bean Leafs take away the shade too much. I've done this for quite a few years now and had big success.
The Sweetcorn, Courgettes and French Beans are the Three Sisters system, they all help each other with the Courgettes giving big ground cover which cuts down the weeds.
It all sounds good but I go by the 50/50 system, you sow the seeds, they either come up or they don't !!
Richard