I know this question is probably a bit "how long is a piece of string" but
I'm asking anyway.

I'm planning the layout of my new allotment and, now that I've decided what
to grow, I now want to work out how many of each plant to grow, to provide
for a family of four.

Obviously, how much to grow will depend on how much of each vegetable my
family eats but, as a rough guide, how many pounds of sprouts will one
sprout plant produce, how many pounds will one potato give, one pea plant
will produce ? lbs of peas, etc.

I've looked on t'internet without success, so does anyone have a list
they've made, know of a book with the info, or know generally from
experience?

Many thanks.