Hi Foz
there is a Frank Keen on the 1901 census Oxfordshire
Not sure he is yours
Charles Keen head mar 53? labourer Oxon Fewcott
Mary " wife mar 51 "
Frank " son u/m 22 " "
Albert " son u/m 19 " "
Maggie " dau u/m 7? "
living at Stoke Lyne, Bicester Oxon
Rg13/ 1388
folio 102
page 11
ricky