I don't think i'd notice 5% Dan. I put a bit more than that into share plans monthly. But I don't break even each month or over spend, and I'm someone who runs a 3 car house. There probably will be people who would feel it, others who'd have to sacrifice a bottle of wine/take-away/night out etc. Now I don't know much about the higher ups and corporations, but if as a people we are all skint, we won't be buying there wares. Surely its got to be give and take for all concerned.
As to the second question, probably not personally. I don't have private health care and would feel guilty not contributing but still taking. I know NHS is only one factor but its an emotive one atm for the country. Doesn't mean I don't utilise my skills and time cash in hand every now and again.
Contributing to society is something I feel is important in general. People who claim dole (I know, old school) but don't contribute or try frustrate me. I'd like to see them benefiting the local community somehow, volunteer work for the council etc. Obviously doesn't apply to people with health issues who can't work.