Sprouts ... too close for comfort

... I had a bit of a noodle moment earlier in the season clearly, cos someone (that would be me!) has only gone and planted my sprouts about a foot apart!!

They're all looking really healthy and small buttons are starting to form ... should I leave em be? Can I move the plants at this stage? Or should I thin em out??

I think you'll find that the sprouts will continue to develop but they will be loose leaves rather than tight buttons