Re: "between 2007 and December 2014"
The contractor higher rate is bullshit. By the time you remove all the pension, sickness cover, training, insurances, redundancy rights etc. And have to cover those and the public indemnity contractors are not actually paid enough any more. In fact for the last 40 years the boards of companies have awarded themselves massive packages by squeezing everyone below. This ir35 crud is really a blue touch paper and Hmrc are lighting it and the result will not be pretty for the little left of UK high tech