x (ii) list = they were wounded, and evacuated. They received treatment that required them to leave their unit, so they are no longer on the strength of that unit.
x(iv) list = they have recovered, and sent back to the Corps, though not yet assigned to a unit
No 1 I.B.D. = No 1 Infantry Infantry Base Depot
No 1 C.R.U. /5 corps = ?
granted S.P.P. = Special Proficiency Pay
I.R.T.D. (or I.R.I.D) = ?
Could you post a scan of that section so we could have a look.