The citation in the London Gazette on 17 April 1918 about the award of the Distinguished Conduct Medal to Sergeant H. Rollinson reads as follows:
7876 Sjt. H. Rollinson, S. Staffs. R. (Bilston, Staffs.).
For conspicuous gallantry and devotion to duty and consistent good work during a very long period. He has taken part in many engagements and has always set a splendid example of courage and energy.
Harry Rollason (as he is listed on Freebmd) was born in 1896. In the 1901 census he is living with his parents, Harry and Eliza, and brother Horace at 39 Raby Street. There is a Harry Rollason who married a Kate Mountford in 1914, but this may have been his father remarrying, as it seems that his mother, Eliza Rollason, died in 1905.
The differing spellings of his name make it difficult to track this man down. His medal does not appear to have been mentioned in the local newspapers. Any further information would be gratefully received!