Hi all
Not a very firm set of answers back I am afraid, some are even saying it is a "poor research" problem which is not very helpful Hurrumph !
Basically most of the replies are along the lines of
I have a very nice MGS with 4 clasps to Lt Benjamin Martin, 4th Foot,he fought in North America where he was severely wounded.In one Waterloo roll it is noted that he was at Ostend just prior to the battle of Waterloo.I feel that he may have still been recovering from his wounds and was possibly in charge of some sort of rear party.However he DID get his portion of prize money for the battle (about 35 pounds) and therefor must have proceeded to Paris with the Regiment.I doubt that he received the medal.
Perhaps some of the private soldiers were credited with two years service even if they did not qualify for the medal, because they also finished up in Paris.I do not know if officers also received two years credited service as they had got the prize money
There are several Waterloo medal awards to Officers who may have been at the battle, but were possibly not.
As you suggested he could well have been carrying out other duties, far from the battle, but when the nominations were put forward, it was probably found to be more acceptable to include that Officer rather than discount him.
I am not sure if the criteria actually mentioned "only Officers present at Quatre Bras +/or Waterloo to receive the medal" and there is certainly at least one who was in hospital at the time, yet did receive the medal