I have a blog
http://loisdesigns.blogspot.com on which I'm running a series on UK Tax for the Small Crafting Business. It's quite in-depth because I did it to fill a perceived gap for people who can't afford to pay for advice but the nature of the online trading internationally at Etsy etc means they need deeper knowledge than they get on free courses by HMRC/ Business Link etc.
I've just done a new post that rounds off this section of the series which has been about the basic theory & practice behind what sort of expenses can be claimed and when (timing). The next run of articles will be on specific expenses like travel, use of home as office etc.
http://loisdesigns.blogspot.com/2011/02/tscb-10-those-rules-apply-to-me-how.html