DD grows more peas than Sainsbury's sells in a year!
His method is to stand at one end of his plot, grab a handful of seed, and chuck it as far as he can! You can see the result from his pic above, as somehow, they always arrive in the rows, numbered 1 - 3,000!
The main problem with planting peas in modules, is that you never get good plants competing for height, as they're always too far apart.
I do despair though, when I see parsnip seedlings in GCs. It's just not right.