We shouldn't be treating it as a competition (unless you want to send two teams out on the streets of Norwich).
"People are often surprised by how many flowers they find, but in some parts of the UK and in particular habitats finding anything in bloom can be a huge challenge. Lists with few or even no results are just as important as long lists. If you have searched and found no flowering plants then your result is still valuable and we want to hear about. Please send us an email stating where you went and we'll include your null result in our analysis." (BSBI)