Just found an iPhone app for lewisham to log anything which needs cleaning up (already knew about the website fro here) but the app is great.
Was walking to work this morning and a tin of paint had burst and was all over the pavement and road. Took a photo my iPhone uploaded via the app and when I got home this evening (most) was cleaned up.
Throughly recommend it! Especially as u don't have to remember to contact the council when u get home. Really useful/ convienient/ quick to use.