Thank you for this long reply, I really appreciate your taking so much time to help.
In searchign for info on him, i found a local railway museum has been donnated a medal for this chap, though they have no idea when/from whom and have no further info, it does suggest whoever donnated it to them, was aware of his railway connection.
The medal they have says "Medal of 264th Railway Construction Company, Royal Engineers" it's in a spinks (sp?) case, with the obverse, words, "France Belgium" on each side of trumpeter and ? R.E. coat of arms.
At the bottom: "The last post" Reverse, "264th Railway Construction Company. R.E" and in centre "Presented to SPR G Lafford R.E. 1915-1919"
For me that confirms his railway company connection.
The longlong trail site shows 264th embarked date 13.5.17 and F&F from 4.17 to 11.18.
I can't see how he can embark in the may, but be in F&F the month before.
Unless he embarked in 1917 but went to F&F 1918?
You mention his medical card showing he was overseas after 1915 so i'm guessing the difference might depend which WR number they refer to?
Also you mention WR.265327 is not a waterways and railways number, I hadn't realised that's what WR stood for and actually it would make much more sence that he worked with the waterways, his pre war apprentiship and 10 years working was brickbuilding on the canals.
Would you think he was given his WR number in 1918 when he went to F&F, and if he served in 1917 would have had a different number? That might tie up the anomolies?
For other serving relatives, i've been able to find their sign up card, and further details written on their forces records, next of kin, a description of them, etc but the personal info seems very very light on the ground for this chaps war service, I thought perhaps i was just looking in the wrong place.
Do you think i'd get more info if i subscribed to the forces war records site, (they keep emailing me 'great offers' )or is this likely to be all there is?