Ben W thinks it would be a good idea to have a "YPP app" which is basically these two spreadsheets (from here):
so that people can quickly look up how much they would be better off (or for a tiny minority, worse off) if YPP's draft budget and tax changes were implemented overnight.
Apparently, the mechanics of this are quite simple, but there's a bit of a faff making it compatible with different mobile phone systems. If anybody knows how to set up an app then please come forward, or if you know somebody who can do it for a good price, please put them in touch with Ben.
Email Ben W.