One other point I would make is comparing these numbers to the petition to Keep Swimming in Forst Hill, a petition that got around 5,800 signatures mainly around 3 wards (out of 54 wards in Lewisham - or 5% of the population).
I'm sorry. I got it wrong. There are 18 wards in Lewisham not 54. 3 wards represents 1 in 6, not 1 in 20. The total number of votes cast in the three wards is closer to 9,000. The petition is the equivalent to 60% of voters in the three wards - slightly more than the top three parties combined. Still a very significant number.