Anatomy of a David Cameron campaign stop

David Cameron is campaigning in key marginal seats in Cornwall before travelling to Brussels for the EU summit.

There has been some criticism that his campaign is too tightly controlled, with few walkabouts amongst ordinary voters.

Carole Walker has been following the prime minister's campaign and has this anatomy of a typical campaign visit...this one was at a small scaffolding company in Penzance.

BBC News Timeliner: Meeting the voters on the campaign trail can be fraught with danger for any politician seeking election, as a quick delve into the BBC archives displays, external