Having been self-employed for so long and pricing by the job rather than a fixed hourly rate, I have no idea what the average would be.
Yes, it's true that officially there is no licensing required in England, although I'm not so sure that would automatically equate to the lowest pay.
That pay in Norway may seem very high, but don't forget that it is an horrendously expensive country, and with very high rates of taxation, even by British standards.
