The burial records for both George Thomas and his son Tom may therefore be found as follows;

Record_ID: 76672
Entry_Number: 1663
Year: 1901
Month: Nov
Day: 22
Surname: THOMAS
Forenames: George
Residence: Manufacturer of Steel Composition
Age_at_death: 69
Officiating_Minister: A H Horlick
Event: Interment
Cause_of_death:
Memoranda: (1) Marley Cottage Coleford (2) South Div: Adult Gr. (3) F 50 (4) Unconsecrated (5)
Notes:
Register_Reference: DA25/204/2
Page_No: 84
Parish_Chapel: Coleford Cemetery
Soundex: T520

Record_ID: 77025
Entry_Number: 2013
Year: 1908
Month: Aug
Day: 4
Surname: THOMAS
Forenames: Tom Pearce
Residence: Gentleman
Age_at_death: 45
Officiating_Minister: A H Horlick
Event: Interment
Cause_of_death:
Memoranda: (1) Morley Villa Coleford (2) South Div: Adult Gr. (3) F 53 (4) Unconsecrated (5)
Notes:
Register_Reference: DA25/204/2
Page_No: 101
Parish_Chapel: Coleford Cemetery
Soundex: T520

Record_ID: 76672
Entry_Number: 1663
Year: 1901
Month: Nov
Day: 22
Surname: THOMAS
Forenames: George
Residence: Manufacturer of Steel Composition
Age_at_death: 69
Officiating_Minister: A H Horlick
Event: Interment
Cause_of_death:
Memoranda: (1) Marley Cottage Coleford (2) South Div: Adult Gr. (3) F 50 (4) Unconsecrated (5)
Notes:
Register_Reference: DA25/204/2
Page_No: 84
Parish_Chapel: Coleford Cemetery
Soundex: T520

BNA Gloucester Journal - Saturday 08 August 1908

Funeral of Mr. T. P. Thomas, Coleford

On Tuesday afternoon the mortal remains of Mr. T. P. Thomas of Morley Villa. Coleford, whose death was announced in Monday’s edition, were laid to rest in Coleford Cemetery, amid signs of sympathy from all sides………………………………..

Moving on, it seems likely George Thomas borrowed his son's name in two of Robert Forester Mushet's own sons, Maxwell and Brooklyn, as this prior thread shows, thanks MPG.
https://forest-of-dean.net/fodmembers/index.php?id=25546

This biography of Robert F Mushet mentions how his sons, Henry Charles Brooklyn Mushet and Edward Maxwell Mushet, were engaged as managers to a firm of steel-makers at Sheffield.
https://todayinsci.com/M/Mushet_Robert/MushetRobert-Bio(1909).htm

I think this Sheffield firm was Samuel Osborn's, who we were discussing just a few weeks ago.
https://forum.forest-of-dean.net/index.php?id=50107

I suspect you may have already searched Maxwell Robert Brooklyn Mushet Thomas on the net Helen, if not then this American web page may be of interest to you, it states how

"On October 14, 1898, my grandfather, Maxwell Robert Brooklyn Mushet Thomas, was born. He was three generations removed from Mary Thomas, born 1818 in St. Briavels, Wales who married Robert Forester Mushet, the inventor of the modern-day steel process."
-Godwin Maxwell Thomas, Texas.
https://www.maxwellrenovation.com/about/

Given Robert F Mushet's choice of name for his son Brooklyn, I wonder if he travelled to New York back in the 1840s, where his steel would be so important in the growth of the city and especially it's skyscrapers ?

DEATH OF MR. GEORGE THOMAS. OF COLEFORD.

The news of the death of Mr. George Thomas, of Morley Villa, Cinderhill, Coleford on Wednesday morning, was received with surprise by many inhabitants in the town, who were not aware of his illness. Mr. Thomas had apparently been in his usual good health until recently, and it was only on Friday last that he felt so unwell as to consult a doctor, but he was able to walk to Dr. Trotter’s surgery. It was discovered that Mr. Thomas was suffering from diabetes, which had evidently been coming on for some time, though he himself was not aware of it. On Saturday he was in his garden, and it was not until Monday night, when he suddenly became worse, that he was compelled to take to his bed, and notwithstanding the attention that was given to him he passed away in about 24 hours. The deceased gentleman, who was a native of St. Briavels, had been a long resident in Coleford. He was connected with the old steel works of Milkwall in its flourishing days, and was a nephew of the late Mr. Robt. Mushet, who will be well remembered by the older generation for his work in connection with the local steel trade. Up to the time of his demise Mr. Thomas held the secret and performed the task of mixing for the celebrated Mushet steel in a private works belonging to the company in Sheffield, which works are situate in the Fetterhill Valley, near Coleford. Mr. Thomas was a man of means, and of late years had purchased considerable property in the neighbourhood. He was of a somewhat retiring disposition, and never took an active part in local public affairs, but was a regular attendant at the Baptist Chapel. He was 69 years of age, and leaves three sons, one of whom has been in Australia for some years. The funeral, which was a public one, took place this (Friday) afternoon.

I suppose that, bearing in mind his religious persuasion, he could have been buried at the Chapel. I know that the original Baptist chapel in Coleford had a burial ground but whether this was still in use in 1901 I have no idea. If it was in use the remains will have been reinterred somewhere else by now. The other possibility is Coleford Cemetery, consecrated in 1868.

In the BNA Gloucester Journal - Saturday 08 August 1908 there is a lengthy article about the death and inquest of Tom Pearce Thomas. Apparently he was involved in an accident during a pony race at the Clearwell Flower Show and, although apparently not seriously injured, died of convulsive fits not long afterwards.

Robert F MUSHET married Mary Ann THOMAS born 1819 St Briavels (record on this website : 23 August 1818)

Mary's parents were: John THOMAS 1775-1853 and Catherine PARRY 1789 - 1863

--

Their marriage certificate is on Ancestry

Robert MUSHETT and Mary Ann THOMAS

15 December 1841, Cheltenham

Robert MUSHETT - Father: David MUSHETT - Free Miner
John THOMAS - Farmer