Hello elliejelly69. I have had a look, albeit briefly, and have found a Harry Farrant at the bottom of
page 65 (the left one) of MEPO 4/346. Is this the one that you are looking for? It has him as starting in 1895 and leaving in 1920. The warrant number is: 80399. The leaving date would fit with what you have.
I have also located the attestation record for this person on
MEPO 4/355/133 (at the bottom right). Does the handwriting look familiar to you?
Hope is helpful, BarnabyP
P.S. I found a few other Farrants in the Registers of Leavers, are these also related?