The question here is what were they used for.
Obviosly available to BEF & from what you say use like this could be extended in date to represent raid use, they should however be under the misc tab as more a type of special forces acting independently I would assume.
Later war are they all dispatch riders? If so not combat units so should not be included as will get abused as scouts.
On that a neighbour of mine started having serious neck trouble several years back & one of the first questions the doctor asked him was "Were you a dispatch rider during the war" which he was. Turns out asking the question speeds diagnosise as a worn out neck due to the constant looking around its a job related injury.
Edit just remembered John said used as scouts
