Hi Simon
Nothing really has changed in the last 8 years!
The arguments for and against are still as described above.
The only extra things to say are that there can be a bit of a "kerfuffle" in changing over from sole trader to limited company but that in itself really isn't a reason to go as a sole trader to start with.
More interestingly, the way dividends are to be treated is changing and so if you are generating a high net profit the advantage of being Ltd and paying dividends is loosing some of its advantages.
From what you have told us about yourself and your plans it seems crazy to go limited at this stage as you will have lots of upfront and ongoing unneccessary costs which given your projected t/o will take a disproportionate amount of your profit.
Oh, and your accountant's bill will also be much higher.
If you went ltd you would also by definition need a separate bank account (not that I would advocate running your business through your personal account-although it is possible to do) and if you sail close to the wind in terms of keeping a credit balance, banks are much less generous at giving overdrafts to ltd companies. Instead you would have to borrow in your personal name to keeps costs of borrowing down but that would skew your balance sheet.
Hope I've not blinded you with science.
Rog