OK - here is the information from, the admissions register. There's quite a bit:
Tom Bullock 10 years and 1 month
received: H M Prison Wakefield
fresh complexion, brown hair, grey eyes, 4 feet 2 and a quarter inches tall, no marks, good health, able-bodied
received at Reformatory 11 Oct 1889 for 5 years
address: Albert Street, Castleford, West Riding, Yorkshire
parish to which he belongs: Pontefract
occupation: Schoolboy
not illegitimate
2nd standard in reading (imperfect)
offence: stealing a purse pf 10s 3d from the person of a female in a chapel
probable circumstances leading to offence: bad associates
date of sentence, magistrate, court: 29 Sep 1889, W F Tempest Esq, West Riding Police Court, Pontefract
where imprisoned: H M Prison, Wakefield
sentence: 14 days [prison], 5 years [Reformatory]
2 previous convictions - 1. fined 10s and father bound over in £5 tp produce him (stealing 10s from a little girl in the street); 2. 6 strokes of the cane and father bound over (stealing 7s 6d from a little boy in the street)
parents: Joseph Bullock (colliery labourer, earns 18s per week), Mary Bullock (both living)
apparently treat boy well
nothing reported against parents' character