On 25 Mar 2005 07:20:34 -0800, (steve) wrote:

Here in the UK the crocus bulbs I put in the Autumn for the first time
are coming to the end of their flowering.

My question is should I leave them in the ground to come up next year,
or am I better off digging them up and then replanting them in the
autumn?

Leave in ground. If they keep spawning more bulbs/plants, you might
want to dig and divide in a few years.