If the GAMCOD project works, there appears to already be a lot of demand for doing it again in areas that are a wee bit warmer. Like maybe the coldest it got in the last ten years is 20F. So freezing, but not as hard of a freeze as our current GAMCOD project.
I also like the idea that future GAMCOD projects might be in the cold areas, but with a stronger focus on perennials.
20F is about -6.7 Celsius so covers the majority of the UK:
source Although I'm borderline (in the yellow coastal zone), we have had -10 or so in the last 15 years since we've been here. I'm running out of potential spaces though....unless I don't play along next year. Edited to add - I had a wander round today and think I still have at least 2 areas I won't get round to improving this year, so maybe.....