“The Valuation Officer explained that there was a sliding scale to be used when considering quantum as follows and did not necessarily include mezzanine areas: Areas under 150m 2 Basic price£80 /m 2 Areas between 150m 2 and 170m 2 Basic price tapers from£80 to£70 /m 2 Areas between 171m 2 and 250m 2 Basic price£70 /m 2 Areas between 251m 2 and 290m 2 Basic price tapers from£70 to£60 /m 2 Areas between 291m 2 and 400m 2 Basic price£60 /m 2 Areas between 401m 2 and 480m 2 Basic price tapers from£60m to£50m 2 Areas above 480m 2 Basic price£50 .”