Later today, the royal row barge 'Gloriana', will be placed in the water the first time.
It will lead the flotilla of boats during the Diamond Jubilee river pageant, ahead of the Queen's boat the 'Spirit of Chartwell'.
Specialist craftsmen have spent the last 18 weeks creating the vessel in a secret location.
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Specialist explosive detection dogs searched through the town examining letter boxes and phone booths for signs of potential devices.
Temperatures soared to 27.9C in Northolt shortly after midday on Thursday, making it the warmest April day for 69 years.
The South East will enjoy the best of the weather and along with Paris will be the hottest place in Europe.