Bolting Brussels

Our sprouts have gone all leggy and are flowering.  They've been in the ground for a couple of weeks. Is there anything we can do to save them or should we start again?

Boo hiss.  Thought as much.
Thanks.

It has been for the last week or so - or haven't you noticed   

obviously the sprouts thought it has been 

I bought a strip of 12 in early March for £1 in the reduced corner of a garden centre.  They looked healthy but small.  Potted them on and left outside in a sheltered corner and they were growing fine while I went away on holiday for a fortnight.  Should have planted them in the ground when I got back but ran out of time and they were left out for a week too long in the mid April warmth.  They put on about 6" in 6 days!  I then planted them quite deeply in the ground and hoped for the best but 'twas not to be and they're now a foot tall and flowering.
Will pull them out and replace with some nice new healthier plants.  Another excuse to visit a garden retail emporium!  Every cloud has a silver lining!