Could someone tell me what herb this is....

http://www.oofus.com/pix/rbpics/odds/herb.jpg

I'm sure it's a very common variety but I have been
unable to identify it from my books and from web
searches.

Also - I would like to set up a small herb garden.
What advice would you give... I have been unable
to locate specialist herb dealers within striking
distance of Southampton or on the web. Is there a
list somewhere of suppliers...

Many thanks,
Roy