Projection clocks: would consist of a small projection device that projects an image of a famous clock onto a wall. The image would show the correct time. (I'm thinking specifically of the Big Ben clock tower). I think they would be popular on New Year's Eve.
TV programme ideas
Supertrain your dog: would train domestic pets to try to reach the level reached by dogs in the Crufts obedience tests.
Battle of the supergroups: A supergroup for each decade - 60s, 70s, 80s, 90s - would be formed with stars from that era. Each group would release a single (a pastiche or cover) from their era and the one with highest sales figures wins.
A crop circle competition: an expanse of artifical corn would be open to the crop-circlers. The most complex circle wins.
One-off remakes of classic programmes: programmes such as 'Dixon of Dock Green' or 'Z cars' would return in one-offs.
'Natural zones' in parks: an area in each park would be fenced off and left to nature.
A 'happiness test' in every census to highlight the wellbeing of the nation.
The 'A to Z of everything' website: For example, A to Z of every British car, tree, programme, Royal Family member, politician etc.
A website with the first ten pages of every book in print.
The music timeline: would chronicle all the phases in music (Rock 'n' Roll, Punk, Ska etc) and the formation dates and split dates of all groups.