Cars delivering guests to the Le Meridien Grosvenor House Hotel (where suites cost up to £1,187 per night) and the Dorchester Hotel will be able to use the hotels' main entrances on Park Lane for nothing. Delivery vehicles using the loading bays round the back will have to pay the £5 charge.
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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.