So how did Mid Suffolk happen? I see that the Greens were already in a strong second place before (16-12-5-1), and have now doubled their seats to take 70% control!
The Green Party's appeal in areas like this where Labour would have no chance is often a NIMBY vote. You might be able to imagine why Green candidates would choose to emphasize the anti-development positions of the party and why voters in places like this might find that appealing. In this particular area, there's a history of Green activism going back to the '80s (maybe just because of one particular activist) and so Greens have made an effort here, which in turn has dissuaded other opposition parties from doing so. Since the Greens have established themselves as the primary opposition here, voters looking to throw out the Tories (as voters were everywhere) naturally chose Green candidates.
