hi, go to your tax office and apply for a cis 4, buy an invoice book from wh smiths, about a fiver, then you can work for anyone , they deduct 18% and the rest is yours. the n.i. contributions will be billed to you from dhss but is only about £20 month. the beauty of this is you can haggle your hourly rate with employers but be realistic, the trouble with ltd coy umberellas is that they charge to much and they actually keep most of the deductable tax for themselves, two years ago i went through a ltd coy in gibralter who deducted 5% of gross and you got the rest , when i did my tax return online i was surprised to get back £535.00
this year i worked a few months through beaver and when i finished they sent me a p45 with only £13.00 payed to the tax office and they had kept the rest! but i still received £212.00 back from the tax office, to try and decypher their pay slips was also impossible.