going back to response rate of leaflets, i find 1%-2%.
best results have always been when i have leaflted myself.
I understand MB why you are doing it this way and am sure you will do well, good luck!
Reading a post from Ian lancaster, he leaflet drops himself and follows up knocking a couple of days later, leaflets have wfp explanation already on. (can get 10% this way)
I have used distributation companies and the real downfall is they put leaflets through houses i wouldn't look twice at, and i ended up running round like a blu ar5e fly; pricing.
MB will you have list of streets leafleted as you could knock saying did you get my recent flyer, and if potential custy is intrested you can price there and then, could help speed up and buid a more compact round.
I must admit i am a cowardy custard when it comes to door knocking but i have often thought if i did move out a bit to get bigger(cheaper property) i woul take above approach.
Good luck

Lee