According to BBC Scotland:
The Ministry of Defence said it was providing 114 personnel, including drivers and support staff, to carry out non-emergency driving work.https://www.bbc.co.uk/news/uk-scotland-58641946
The number of Army ambulances being provided is unspecified.
According to the Scottish Ambulance service they have:
around 1 500 vehicles and over 5000 staff and 1200 volunteers.https://www.scottishambulance.com/
So, the Army will be increasing the ambulance service staffing by 1.8%.
Colonial Governor Alister Jack thinks this make the Union worthwhile, imagining imperial ambulances crossing the Tweed to help. Wouldn’t an independent Scotland have an army and a few army ambulances?