Now on the no-dig regime, the leeks followed broad beans. With the compost layer down to 25mm, simply took the (otherwise resting*) digging fork, plunged in to full depth 150mm and wriggled sideways a little. Because the plan is big leeks(?), then planted a trimmed leek into every other tine hole, that's about 100mm centres. Eased in to depth, 100mm approx with a pencil sized cane. Watered in.
They will be lightly earthed up in early September.
* It is likely to be used to ease out the crop, but not digging!