Despite it's exotic/asian associations, coriander grows very well outside in the UK. It can be sown straight into your plot, but make sure you keep it moist, otherwise it can run up to seed.
Time from seed to plate: 8 weeks
Sow coriander directly into your plot anytime from April to August. Lay a narrow piece of wood across your bed and drag a trowel along the edge to create a shallow groove in the soil about 1/2in deep. Sprinkle in the seeds, aiming for one every half inch or so. Sow two rows 12in apart. Firm the soil back and water well.
After harvesting, coriander doesn't grow back as vigorously as other herbs so it's a good idea to follow up your first row/sowing, with another a month or two later to give you a steady supply.
Thin your seedlings to leave 2-3in between plants.
If you see any flower shoots heading up cut them off, otherwise your plants will divert their energy into seed instead of leaf production. Regular watering also reduces tendency to bolt.
The slugs on my plot don't seem to be attracted to my coriander. For once we have respite from the slimy devils!
Chop off the leaves as you need them.
If your plants do succeed in bolting, harvest the seeds green and add them to spicy salads or stir fries.