quick plant co-planating (*un*companiable planting) question: leeks

in Fruit & veg
I've not grown them before... (well except fo a failed attempt in pots): is there anything I shouldn't plant them with other than peas and beans? Will courgettes be ok?
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It's a bit late to sow carrots, I guess...?
I am so behind with everything this year, but large bits of the first 6 months were intermittently wiped out. This is only my first lot of courgettes.