Olympic Ambassadors will be back on the streets of London today. Volunteers will be in "pods" at St Pancras International Station to welcome tourists arriving on the Eurostar.
It's the first of a series of pilots to test the project. There are 55 volunteers taking part.
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Police are investigating whether a Land Rover Defender found burnt out in West Horsley was involved in Tuesday night's ram raid.
The work, called Gift Horse, replaces the giant blue cockerel that previously sat on the plinth.
50 of the country's worst pollution blackspots are in the capital. Many in places you may visit every day.