Hi Darkside
Have looked on the 1891 census for your John Walter Sumner, with the results listed below. - but as you can see, there is no John Walter, although several John W, but non connected with kent or Speldhurst
1891 England Census
John W Sumner
Name Age in 1891 Birthplace Relationship to head-of-house Civil parish County
Sumner, John S W 14 Bow, London Son Walthamstow Essex
Sumner, John W 6 Crewe, Cheshire Stepson Macclesfield Cheshire
Sumner, John W 23 Manchester, Lancashire Head Ardwick Lancashire
Sumner, John W 14 Blackburn, Lancashire Son Blackburn Lancashire
Sumner, John W 35 Preston, Lancashire Head Blackburn Lancashire
Sumner, John W 16 Clayton le Moors Chapelry, Lancashire Son Clayton le Moors Chapelry Lancashire
Sumner, John W 3 Liverpool, Lancashire Son Everton Lancashire
Sumner, John W 9 Westleigh, Lancashire Son Leigh Lancashire
Sumner, John W 36 Hoole, Lancashire Head Leyland Lancashire
Sumner, John W 2 Preston, Lancashire Son Preston Lancashire
Sumner, John W 49 Preston, Lancashire Head Preston Lancashire
Sumner, John W 24 Preston, Lancashire Son Preston Lancashire
Sumner, John W 12 Medlam, Lincolnshire Son Wyberton Lincolnshire
Sumner, John W 33 Rotherhithe, Surrey Head Greenwich London
Sumner, John W 1 Warwick, Warwickshire Son St Mary Warwickshire
Sumner, John W 2 Sheffield, Yorkshire Son Ecclesall Bierlow Yorkshire
Chris in 1066Land