B5 would be on my watchlist too, unfortumately it isn`t available on netflix or sky.
I think you can still buy the dvd sets from Amazon.
Yes, or you can buy it to stream. It's also one of those shows that gets picked up by Amazon or Netflix for about 6 months or so, then disappears only to pop back up a year later. So, if you're patient, you may be able to stream it again in the future. I'd give it a recommend to just buy it. Just start with the 5 seasons and if you enjoyed that get some of the movies. But, whatever you do, do NOT ever buy or watch Legend of the Rangers.