Spartacus - When it comes to posters/flyers, you may find the results of a survey done last year in our state (Montana) interesting. When asked how they got information on the arts, a sample of over a thousand respondents gave the following response: Newspaper 56% - Radio 13% - TV 10% - Word of Mouth 6% - Internet 4% - Flyers 1% - Magazines 1% - Mailings 1% -This survey pretty much confirmed what our small arts organization has felt for many years -- posters are useful, but, by themselves, do not give a great deal of "bang for the buck". This is of course in a rural state. If you're plastering alley walls in downtown London, it may have a more telling effect!
In my experience, posters seem to have great appeal to performers because they can "do them theirselves," or and burn off a lot of nervous energy getting out and putting them up, making them feel that if they worked so hard at plastering the town, they're bound to get a big crowd.
I'd put my bucks in a good radio spot!