Hi Guy. This is way out of my league but looking at the National Archive for the diaries it states from April-June 1940. Catalogue description 214 Army Field Company Royal Engineers Reference: WO 167/971 Description: 214 Army Field Company Royal Engineers Date: 1940 Apr.-June Held by: The National Archives, Kew Haven't a clue if this helps ? Mike.
They don't appear to be included under the arm of service serials in the 11th April 1940 listings...which may or may not be significant.
Arrived Le Havre 2nd April 1940 at 0800hrs and some of the Company left France via the beaches near Malo les Baines between the afternoon and midnight on the 28th May and the rest from the East Mole at Dunkirk on the 29th May.