Hello K182.
I could only find two J Bucklands in the Alphabetical Register of Joiners running from 1902 to 1933. They were:
Warrant No. Names, Date of Joining, Division
101403, Buckland, James Andrew, 1912-06-24, W
Division W was Clapham though. There is a cancelled leaving for this person in the Registers of Leavers in 1915 and they were still in division W. They could have transferred though.
There was a James Alfred Buckland (96497) who joined in 1909 and left in 1924, who was in division N (which is around Islington) for that whole period.
Neither of these look helpful as neither meet the criteria given.
Yours, BarnabyP