Not sure which Sidney this is?? although previous thread gives the 1911 census mother : Martha

1911 Census, Causeway, Cinderford (living in 4 rooms)

Martha GRINDLE - 52 Widow, born Alvestcott, Oxon
William FENNELL - boarder - 29 - Coal Hower, born Yorkley
Sydney GRINDLE - son - 14 - Hauling (underground) born Cinderford
John PELL - Grandson - 3 - born London.

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Looking at British Newspapers on line - there are about 4+ articles (if you search for Sidney GRINDLE).....

As I don't subscribe, can just reach brief outlines : from 1907 til 1911 - some talk of his widow mother Martha

and include

1907 GloucesterJournal District & Parish Intelligence

defendent would sent for one month;s hard labour. Sidney GRINDLE a boy of Littledean Hill, was summoned for assaulting Archibald DAVIES, another boy of the same place - on the 23 September - John GRINDLE, George BEVAN and William BEVAN, Colliers, Littledean.

etc etc

The medal card on Ancestry shows that Pte 12242 Sidney O GRINDLE was awarded the Victory and British War medals. There is no Correspondence information on the card. The Service Medal and Award Rolls give the same information but record him as a Lance Corporal in the 7th Battalion the Gloucestershire Regiment.

BNA Gloucester Journal - Saturday 13 May 1911

Littledean Petty Sessions

Martha Grindle, widow, Causeway, Littledean, was summoned to recover £1 4s. arrears under an order dated 10th June. 1910, in respect of her son, Sidney Grindle, who was sent by the magistrates to the Cardiff and Barry Industrial School. Defendant wrote saying she had no means, and she saw nothing before her but the Workhouse.—Supt. Griffin stated the facts, and the usual order was made.

BNA Gloucester Citizen - Saturday 28 September 1907

Sidney Grindle, a boy of Littledean Hill, wae summoned for assaulting Archibald Davies. another boy of the same place, on the 23rd September.—John Grindle, George Bevan, and William Bevan, colliers, Littledean Hill, were summoned for using threats toward Rhoda Davies. —The complainant in the first case said when he had finished work he went out and saw Grindle, who challenged to fight four of them. He afterwards got witness down on the road, knocked him in the eye with his fist, and "scruffed" him. Witness did the best he could against the boy, who was younger than witness. Sidney Meek said he was outside in the road, and all once there was a scuffle amongst the boys. He took it to be his duty to part them, which he did. It was a fair fight.—Jesse Brain corroborated.—Defendant said he just pushed against complainant, who "had his hair off." He threatened to choke witness and kill his pigeons. Witness then knocked him down. —This case was dismissed.— The other case was then proceeded with.— Rhoda Davies said on the day named the boys came up into her garden, using very bad language. Bevan said, "I am W. B. Bevan, the champion boxer; bring thee son Tom out here; I can give him enough". The two other defendants also used bad language.—Bevan said he would be able to prove that he was in bed at the time which the row was alleged to have occurred namely, nine o'clock. —William James Gabb, collier, Littledean Hill, said the defendants were going to " fight the road." Defendants said they would " make a box o' cold meat “ of him. of Mrs. Davies.— Edward Bassett, collier. Littledean Hill, said heard defendants using very bad language to Mrs. Davies. One of the defendants said to Mrs. Davies,” Bring your ***** son Tom out here; I'll make a box o cold meat of him." They were flinging stones at Mrs. Davies.—Alfred Bowkett. collier; Harriet Goode, wife George Goode; and George Davies, complainant's husband, corroborated, the latter saying that Grindle called his wife “ a ***** old brown jug."— Bevan was sworn. He said he went to take the other defendants parts. He did not see Mrs. Davies that evening.—Emily Bevan, mother of the last witness, said her son was in bed at nine o clock, he came home earlier than usual that evening.— Defendants were each bound over in £5 for six months and ordered to pay £2 0s. 6d. costs.