Thank's everyone for the assistance, I will absorb the informative advice and investigate further.
It would appear (in accordance with Ken's advice) that Abraham enlisted in the 1st Battalion of the 4th (The Kings Own) Regiment of Foot first raised in 1751 to the very year of his death in 1867.
I am now searching for a picture and details of the type of uniform he would have worn, cap badge, insignia, etc.
Really appreciated, Renaud.
