CCTV footage from cameras linked to the RAF Club in Piccadilly opposite the Bomber Command memorial shows a man approaching it between 3.10am and 3.20am on Monday.
The new images released shows a man suspected of being responsible for the graffiti-desecration of the £7.5 million Bomber Command memorial.
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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.
The Foreign Secretary insisted police had to "come down like a ton of bricks" on gang leaders as he warned against "going soft".