At Euston fire station drivers in lorries, cars and taxis sounded their horns in support of the firefighters. The union's own fire engine was driven onto the station forecourt, with Johnny Cash's Ring of Fire song blaring from a loudspeaker:
We have been receiving a lot of public support today at picket lines across London.
There is solid support for the strike - but it is a sad day in some respects because firefighters don't want to be on strike.
More top news
A man from London who was the subject of cruel online taunts has had the last laugh when a group of celebrities threw a party for him in LA.
Taffazul Hoque is 38 but suffers from autism and epilepsy. He is in danger of having a seizure and is sought urgently by his family.
Rachel Key told ITV London she was really nervous about presenting the trophy, but as a lifelong fan, supremely honoured.