Jackie,
my understanding of the "Mention In Despatches" is that unless it was awarded for gallantry it will have no citation. There are specific times (and more usually in non commissioned ranks) when the award is granted (only in the face of the enemy), and will have some sort of citation. (Usually, the soldier was being put forward for the Military Medal but was not recommeded at the medals committee)
More generally (Commissioned Ranks) it was awarded for meritorius service (Not in the face of the enemy) and carries no citation.
I think you can apply to the medal office for copies of the award (MID)
His DSO and DFC* will carry citations.
Hope it helps