East trench extension at start of work ... Scanned 2005 for the 75th anniversary exhibition and publication. 51 Horizontal (normal) ... 20 Feb 1933
Mixed ... H. Α. Thompson ... 1 194 ... 1933
House 631/26 ... Η'-1 51, 52 Section Η' 2 Section Η' 3 Section Η' 4 ... 20 February 1933