I think I would wait until they have finished flowering, as they may not like being moved and you would ruin this years display.

Wait until they have died back and until the leaves have died, too. They need this time to store up strength in the bulb for next year's flowers. Give them a little feed after the flowers wither and before you take them out of the pots to plant them out.

Agree with Ojibway let them be until they totally die back and feed them

Dormant bulbs are much easier to deal with than when they are still in growth; and it is much better for the corms.

Thanks everyone - one last question - what do I feed bulbs with?

A spoon?
;)

Half strength tomato food once a week after flowering and whiles the leaves are still green

Ha Ha...I asked for that Lil :)
Thank you MG :)