Then gather the compost into little piles all over the board and leave for about half an hour. The worms will all migrate to the bottom of the piles away from the light, you just pick the tops off each pile and put them in a container. This is your compost. The worm population is ready to go again, in fact you should have enough for two wormeries. If you really want to increase the population then you can pick through the compost carefully looking for the egg cases which look a bit like rather large grape pips.
Worm compost is the best compost.
A little goes a long way, its a wonderful addition to any potting mix or as a top dressing to tired potted plants.