PS: It might be simpler to make your TV 'smart' by buying a Now TV box. They come with apps for sending TV catchup services (BBC iPlayer, ITV Player, 4onD, Demand5) and things like Youtube directly to your TV set. They only cost £9.99 (inc p&p) but you can also get them complete with 3 months entertainment package (inc GOLD, Sky 1, Sky Arts 1, Comedy Central, etc) for £16 in Asda (if they've not gone up recently) or £20 in Tesco (but with a total of £2.70 in Clubcard points, if that offer is still on). If you want to keep the entertainment package after 3 months you have to pay £6.99 per month but there's no commitment to a subscription:
http://www.nowtv.com/box