The mayor of London has approved the redevelopment of a Richard Seifert-designed hotel in west London after securing a threefold increase in the number of affordable homes going into the mixed-use scheme.

Sadiq Khan had called in proposals from SimpsonHaugh to replace the 1970s Forum hotel in Kensington with a taller scheme featuring 749 bedrooms, 340 serviced apartments and an initial figure of 46 new homes – 20 of which would be affordable – last November.

The plans had previously been refused planning by Kensington and Chelsea council.