I'm not convinced that the area dictates very much the type of party provided.
My local dgc have gone to parties at 'venues' and take a gift of around £10/£15. At their local primary school where the party circles are made up from, it is a very broad mix socially, from the higher paid to others on benefits. The fancy parties appear to be provided regardless.
In my original post I mentioned that I had asked a family member who lived abroad what they did . This family member and his wife are both professionals and have lived in the USA for many years, that is where they came across the 'bring a book' idea. They live quite modestly in order to be able to afford to live in a nice-ish area. They plan on doing the bring a book for their own child's birthday this summer and having a party - old style- in their garden. Perhaps even in the USA they are getting fed up with the OTT approach and looking back to the simple fun.
I am delighted at the positive response to the bring a book idea. It only takes a few parents to take a stand in their child's social circle and the idea could well take off.
And most likely, there would be many happy parents. 
Petition to stop the EARLY RELEASE for PC Harpers killers
