Niall, would the fact that all the individual buildings are listed not protect against any significant redevelopment? Owning a listed building, I know the hoops you have to jump through to even paint the windows a different colour, let alone raise the roofline! The Rusacks extension was built on what was a car park, so didn’t have that additional protection.
As an aside, i had dinner in the new restaurant on the top floor last week. Nice enough but I won’t be rushing back. It’ll no doubt do very well though - the views at least are something special.