Removal of basement boiler plant and conversion of associated accommodation to form new ancillary meeting room; replacement of four basement windows; minor alterations to fenestration to early 20th century Ground Floor extension including new boiler flue over flat roof and re-routing of existing heating pipework between Basement and Ground Floor levels. Variation of Condition 1 of permission 20/00330/F. Minor change to elevation on twentieth century extension. Substitution of new drawings.