Each energy supplier is free to decide how they'll roll out the programme, with British Gas currently taking the lead. So your next door neighbour (with energy supplier A) might already have a smart meter but (because you're with energy supplier B) you might hear nothing at all for a few years.
Quote:
" The government expects that smart meter installation will:
accelerate sharply in 2016, when all the common standards come into force ;
include around 20 million meters fitted between 2016 and 2018 ;
peak in 2019 and finish in 2020."
Source:
http://www.smartenergygb.org/national-rollout/how-its-happening
However (as with nearly all such major initiatives, it seems) the scheme is already running behind schedule:
http://www.telegraph.co.uk/news/earth/energy/11242115/11bn-energy-smart-meter-roll-out-suffers-fresh-delay.html
Also, if you're the type of person who believes that the moon landings were faked, that aliens landed in Rendlesham Forest and that Johnny Vegas is actually funny, you might care to read this load of rubbish ;-)
http://stopsmartmeters.org.uk/