One of the many digitisation projects sparked by the centenary has been carried out by the International Committee of the Red Cross. They have digitised the Prisoner of War records from their archives which were released (80% complete) on 4 August. The site can be found at http://grandeguerre.icrc.org/.
The release of these records has allowed me to clear up one of the outstanding identifications from the roll. Listed under Dorking was a W Hills, recorded as being a Private in the Queen’s (Royal West Surrey Regiment). From census records the only plausible candidate seemed to be the William James Hills living at Chalkpit Cottages in 1911, but I had not been able to find any military information. The roll also indicates he had been a prisoner, so the Red Cross records were an obvious avenue to explore.
A little experimentation showed that the records tend to be grouped under a single variant, so Hills appeared with those named Hill. At first it seemed I would continue to draw a blank. None of the records for the Queen’s matched, but I noticed that some men were actually in Queen’s Own (Royal West Kent Regiment), so eventually I looked at the section for those too, reasoning that the confusion might work both ways.
There I found a record card for William Hills. Using the reference numbers recorded on the original card, this links to 3 other records. These confirmed he was William J Hills, and giving a home address matching the 1911 census, the birthplace of Burpham, Arundel also matched. But he is shown as belonging to West Kents rather than West Surreys
So in fact it was the roll of honour which was incorrect and had muddled the West Surreys and West Kents. With his regimental number from the card (initially wrongly recorded as 14619, but an amendment on the card indicated it should be 17619) I also found a matching medal index card, but sadly (but unsurprisingly) no service record. However this is quite enough to be sure of the identification.