Boris Johnson will not block the development of P&O Estate’s 1.4m sq ft towers scheme at Waterloo Station.

The Mayor of London had until 19 October to refuse planning permission for the Allies & Morrison scheme, after it was granted consent by Lambeth Council in July.

He had previously said the £1bn scheme was ‘unacceptable in strategic planning terms due to the impact of the proposal on the setting of the Westminster World Heritage Site.’

However, in a planning report dated 17 October the Mayor went back on his previous claims.

‘On balance, the proposal will not damage the outstanding universal values of the World heritage Site,’ the report said. ‘There is an impact to the setting of County Hall and the Royal Festival Hall and other views , but this impact is not sufficiently intrusive to justify refusing planning permission.’

The report says the Mayor is happy for Lambeth Council to determine the case itself.

P&O is proposing three towers at the site next to Waterloo train station. Around 845,000 sq ft of offices will be located in two towers, 28 and 22 storeys high.

A third, 33-storey tower, will house 274 apartments.