Goodwill

I have a client who has transferred his business as a sole trader into a Ltd company in order to save tax and NHI etc. What are the pros and cons of introducing a goodwill figure into the accounts, and how would it be treated in the final accounting period of his SA return. Ie would it be treated as a capital gain or a trading receipt.I have down loaded guideance notes CA72300 and CA 71000 but they dont make much sense

If it is a good idea what are the tax advantages for the Ltd compnay Should it be treated as P and L expense and are there any guidelines as to the rate to be used for amortization