Spring bulbs.

The bulbs will have put some decent roots on by now, so if you dig them up you'll be best off potting them up in a bit of compost to keep those roots alive.
As you say, the best time to lift them up is in early summer when the foliage is dying off but you can still find them.

Thanks Martin. They don’t need lifting yet. Also I know exactly where they are so summer lifting is perfect.  They’ll probably be going into pots anyway as there’s a fairly high chance the garden won’t be ready for them to go straight in.