If you need to remove the bulbs from the containers, Helen, then leave until the leaves have died off and allow the compost to dry off to some extent (for your own comfort when you are emptying the containers!). If the containers are moveable then you could put them under cover as the leaves start to yellow and with-hold water.
I then inspect my bulbs for any damaged or diseased ones, which go in the bin, and then allow the 'keepers' to dry off. I prefer to replant the bulbs in dry compost straight away but you could store them in paper bags kept in a cool, dark, dry place until August/September and replant then.
Crocus foliage should have almost died away now so this is the time to lift and divide them if needed. Better before the foliage has completly gone so that you can find the things - if in the garden!

Most spring bulbs need cold weather to regrow, so store them outside in well draining soil. Tulips will also prefer if the soil they are stored in warm over summer.

Thank you very much for your advice.

Helen

Good advice from the above. I have just lifted mine and after the leaves have dried out I cut these off and also the old roots then give the bulbs a clean up so they look like the ones you see for sale at garden centres.

Thanks