Until now there has been a loophole in the regulations that kept the online leg of BBCs broadcasting outside the need for a TV Licence, the mandatory payment for watching television that funds the BBC. That loophole said that only live TV delivered through iPlayer was subject to the rules and not on-demand content. This has now been locked down by the Beeb and the Government and if you watch, you pay.
A TV Licence costs £145.50 a year and applies to anyone who watches live TV and BBC content. Other on-demand, online only services from ITV, Channel 4 and the likes of Amazon and Netflix remain unaffected.