The NO2ID wikipedia page says we have 60,000 registered supporters. I didn't know it was that high - maybe someone can confirm.
Yes. Roughly. That includes some duplicates and a significant number who are in practice uncontactable, however.
Supporters are not evenly distributed. Some local groups have recruited thousands, even in quite small towns, others hardly any. So that 60,000 represents a potential many times larger.
The £40,000 Dave refers to was a one off exercise to make the basis for a legal fund. It is not any part of the money we have to spend day-to-day.