Depends how long it is since you put the pot of compost under them, remember the runner has got to establish roots before you remove from the parent.

I would agree with Moon Grower. The runners need to establish roots into your pots of compost before cutting the stem connected to the parent plant. I've propagated my strawberries this way for a few years but this year's fruit yield is poor so far :(

If you really don't want to use the pots though you can always just let some root into the ground and move them in the autumn but you'd probably get better plants with pots of compost.

Agree. The runners will develop plantlettes. Once the plantlettes take root, you can cut from the mother plant.

Thanks a lot I'll keep them connected to the parent then!! Another job for the weekend :)