He said: "None of us are arguing against the use of solar panels one way or another." He said members needed to know whether solar roof tiles were a viable alternative before reaching a decision. "I think the proposal for solar tiles is interesting... they could come back for a variation of the permission if they decided to go down the route of solar tiles instead of panels." He also questioned whether replacing the entire roof with solar tiles would be affordable, describing it as "massively expensive". We're talking about solar tiles on the building and we're asking for proof of it."