I don't see a clear answer to that. The cost of all the waste collection services is £7.1-8.2m. (It is £7.8-8.2m currently):
http://councilmeetings.lewisham.gov.uk/d...ervice.pdf

As I read this, they are budgeting for the new garden waste service to be a flop, in which case there is no saving. We also mostly compost and so can't justify this expense for a weekly service. We are left with more car trips to Landmann Way - some others will surely fly tip instead.

I feel that the consultation results, as published, are disingenuous. They do not show the proportion who did not answer questions:
https://www.lewisham.gov.uk/myservices/w...esults.pdf

It *may* well be that most people wanted a garden waste collection but it is not clear that most wanted to pay for one (£80 was suggested). If the council reached their decision based on this report then their reasoning is surely flawed.