Commuters at Watford Junction were joined by a surprise traveller this morning, Prime Minister David Cameron.
 

Mr Cameron was seen struggling to find a safe seat as he perched on a rail at the station platform earlier today.
 

It comes after he visited a building site in Cheshunt to announce a new package of measures to promote economic growth with the Deputy Prime Minister, Nick Clegg.
 

A Downing Street spokesman said: "The Prime Minister often travels by public transport - this is not unusual."
 

Mr Cameron was also seen at Burston Garden Centre in St Albans this morning, where he had a coffee.