Ancestry has some transcribed / images from the period, such as :-

Name: Frederick Ambrey
Age: 31
Birth Year: abt 1867
Residence : Berry Hill No Coleford Gloucester
Regiment Name: S W Borderers
Regiment Number: 1346
Document Year: 1898
Number of Images: 15

Name: Frederick Ambrey
Age: 27
Birth Year: abt 1867
Birth Parish: Monmouth
Birth County: Monmouth
Regiment Name: South Wales Borderers Regiment
Regiment Number: 5352
Document Year: 1894
Number of Images: 4

Name: Arthur C Ambrey
Regiment or Corps: South Wales Borderers, Gloucestershire Regiment, Royal Warwickshire Regiment
Regimental number: 46026, 38449, 35563

It seems a little pot luck as records have been lost over the years. A vist to Kew might be in order - if its practical :-)