Is every discharge number unique to one person? I ask because there are 2 cards with the same name and discharge number but one has a birthdate of 1880 and the other of 1875, I assume that's just a mistake? Also would it be normal for someone to have a BT348 and BT350 but not a BT349?
 I'm also not sure how to tell which of the following records belong to my relative.
The top transcript is definitely mine, is it possible to tell if any of the following ones belong to him too? 
Should I dismiss the ones stamped MMO Poole and North Shields? 
William Thornton date of birth 11 Jul 1900, Hull, Yorkshire
Identity certificate number   475881
BT350 Card type   CR10 (1918-20)
====================
William Thornton
Discharge number   940528
Ref: BT348/1 Card type   CR2
1921-1941
====================
William Thornton
Discharge number   940528
Ref BT348/ 1 Card type   CR2
(1921-1941)
======================
W Thornton
Discharge number   1036373
Ref: BT348/1 Card type   CR2
Date range   1921-1941
=========================
W Thornton
Discharge number   1036373
BT348/1 Card type   CR2
Date range   1921-1941
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