The first bike in the line, ZD286 is engine/frame number WM20.3969 despatched to Ministry of Defence,Dublin 22/06/1940 and the third one, ZD280 is WM20.3937.despatched on the same date.Unfortunately I have no information on where the picture was taken.
2 Ford Scout Car, either 16hp or 30hp V8 with locally built rear bodies. Probably belong to a Motor Squadron of which there were 7 throughout the various commands.