Architect Terry Farrell & Partners’ revised masterplan for the Paddington Health Campus has been strongly criticised by Westminster council.

In a letter to the practice the council said that “fundamental concerns” about the height, bulk and form of the proposed buildings remained.

The letter is another blow for the Paddington PFI project, which has seen costs rise from £382m to £800m.

The letter says: “The submitted model appears to have a number of significant inaccuracies in the height of proposed and existing buildings to the extent that it provides a very misleading picture of the proposals. It also depicts buildings that have not been approved as well as schemes that have not been submitted for consideration.”

The letter is critical of the increase in height of many of the proposed buildings, such as the 85 m residential tower, the 45 m block behind the Clarence Wing and the Winsland Street block that could be up to 52 m. It says that the bulky buildings would have a “far-reaching and detrimental visual impact”.

Farrell’s plan to build on either side of the Grand Union Canal also caused “significant concern”. Farrell had been asked by the NHS trust to include additional buildings on the north side of the canal after developer Chelsfield agreed to exchange the land for a lucrative site at the Royal Brompton Hospital in Chelsea.

The council also called for an analysis of the impact of the project on a nearby building, the North Westminster Community School and post office, which the council plans to dispose of in the next three years.