A list of classic Doctor Who serials that are licensed by BBC Worldwide to various streaming sites free of charge and completely legally (they are paid for by the advertising on the sites in question).
As far as I know they are not available to see outside the UK.

( Under the cut )

Very good.

( My thoughts - Beware spoilers )

Loved it.

( My thoughts - Beware spoilers )

( Full list under cut )

I am a sock!