Netflix has seasons 1-2 available for streaming, but does not yet have season 3. They do have season 3 on Blu-Ray and DVD, though, if you have a disc plan.
Yes it is. I recently rewatched it on Netflix.
if Not, try PBS.com... iirc, PBS aired them in the US the Month after the UK saw them, and once they aired they were on the network web
yep
I believe so, yes (:
