small business valuation when soletrader sell to limited company

hi there, I need  help,I need to learn more  about ;how to value a soletrading business when the owner sales the business to the new form limited company,  I had some learning materials from my ACCA  study but they do not cover  in details the methods ,the approach  etc,aslo bought a book but it is not of much help.I think it would be helpful if I was recommended a studing materials with exercise kit or short training course to cover the whole process  and to comply with UK legislations.could anyone recommend please, affordable suding materials or course to attend?