Hi Adrian!
Thanks for the kind mention. mymicroisv.com is still a work in progress, but I will be adding to it every few days.
BTW, the book is out in the U.K.: http://www.amazon.co.uk/exec/obidos/ASIN/1590596013
and as an ebook at: http://www.apress.com/book/bookDisplay.html?bID=10057
More than a few of the micro-ISVs I interviewed for the book hail from the U.K. and there's a section on what it takes to legally set up business in the UK.
Cheers,
Bob