New Life

Way back in late October last year I spotted three green caterpillars on a broccolli plant in the garden. Nights were cool so I cut the stem, placed it in water, and took it into the garden shed. Within a couple of days the largest caterpillar disappeared but the other two smaller, underdeveloped, stopped feeding.
Thought no more about them until two days ago when I saw this on the side of a bottle in the shed....

Thinking, if it emerges it might struggle to get out of the shed, so placed the bottle in the garden frame.
Yesterday morning, and hey presto, this.......