It is very hard to discern the ribbons from the photo, 'though I agree that there seem to be four of them. Any chance of a better copy of the photo ?
That said, could he have served in the Territorial Army or another volunteer service at some time between the wars ? Could the additional medals be Efficiency and/or Long-Service medals ?
Could he have Police or Fire Service medals, which would be worn after the WW1 service medals ?
Maec