If you're in Haringey you could try Haringey Circle who are just launching a tradesperson and gardening service: 020 3196 1894.
From Public Voice
Sorry ... never heard of PV..
Hello Rosemary. A lot depends on what area you want to cover but I bought a couple of security lights from Screwfix. They are solar powered ( charge up during the day from sunlight ) and just stick or screw to the wall so there is no need for wiring. They switch on whenever anybody approaches and off again when they have gone.
I use Sven (077 4890 7654). He is good and his prices are always reasonable.
thanks for this