My Dad has had a look at my Mum's family tree and unfortunately there aren't any clues on there regarding Albert's middle names. I have done a bit of research into Percy James and found that he was killed in November 1915 in France. I have shown below a summary of what I found and hope it is is of some interest,
Percy James Pibworth Pvte 3628 1st London Regiment(Royal Fusiliers)
8th Division 25th Brigade
Killed in Action France 7/11/1915
The diary of the 1st London Regiment(Royal Fusiliers) records that for the period 1st - 4th November they were allocated as the Divisional reserve force.
On 5th November they were ordered to relieve the 7th Middlesex Regiment in the trenches and billets at FLEURBAIX. A & C companies went into the trenches. Capt R B G Glover is reported killed by a Sniper.
The Sniper obviously had the trench in range as on the 6th and 7th November the diary entry reads “A quite day. 1 man killed.” So we can assume that Percy was the casualty listed on the 7th and was most likely killed by the same sniper.
Percy is burried in Y FARM MILITARY CEMETERY, BOIS-GRENIER row M plot 14.