Cabe has strengthened its support for the proposed extension to the British Museum in London designed by Rogers Stirk Harbour & Partners but is calling for a re-think over the main facade.

The practice’s first design was rejected by Camden Council in July, after meeting strong opposition from local preservation groups including the architect-led Bloomsbury Conservation Area Advisory Committee.

It has now altered its plans for the £135 million project, burying a fifth of the scheme underground to protect views of the Arched Reading Room.

In its second design review of the project, Cabe’s review panel called the scheme an “intelligent” response to a difficult brief and highly constrained site.

But addressing the proposed elevation onto Montague Place, it said: “The detailed composition of this facade could be improved, and we suggest exploring a design which responds more subtly to the massive corner of the existing building.”