Maurice served in the Army Service Corps during WWI, serving for a great deal of the time in France.
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From the Uxbridge & W. Drayton Gazette - 14 March 1924:
CIPPENHAM
RETIRED CLERK'S SUDDEN DEATH - At Broom Cottage, Cippenham-lane, Cippenham, on Wednesday morning, the Coroner, Mr. A. E. W. Charsley, held an inquest on the body of Harold Thomas Roberts. aged 62, a retired War Office clerk, of Broom Cottage.—John Turner Roberts, brother of the deceased, deposed that he saw him last in May, when he was not in strong health. He had since received a letter from him every fortnight, and in none of them was there any complaint. The last one, which be received about Feb. 19th, was written cheerfully. He did not think there had been any foul play, or that it was a case of suicide.— Maurice Theodore Knibbs, a painter, of The Brooms, Cippenham-lane, Cippenham, said deceased had rented rooms from him since September last. He did no work, and what meals he had at home he prepared for himself in his front bedroom. During the past fortnight he had complained about his chest. He called witness to his bedroom 9-40 a.m. on Sunday, when he was lying in bed. He said, " I do feel queer; would you mind running into Slough and getting me something from the chemists' " Witness cycled into Chalvey and obtained a bottle of medicine, gave him a dose, and advised him, if he did not get any better, to see a doctor. Deceased said he would do so, but that he would try and get some sleep first. Witness went out, and when he returned about 2 p.m., his wife said she had not heard any more of Mr. Roberts, and wondered whether be was all right. Witness went to his bedroom and found he was dead.—Dr. Herbert Fraser, of Slough, who had attended the deceased once or twice, said a post mortem examination showed that deceased had extensive consolidation of the left lung, while the aortic valve of the heart was diseased. The cause of death was the heart trouble, which was aggravated by recent inflammation of the lung.--A verdict of Death front natural causes was returned.
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We see Maurice and Margaret, living at 20 Chestnut Avenue, Slough, Berkshire, at the time of the 1939 Register.
Living at the same address were Rose I Cryer, 39, and Gladys M Rands, 29.
Maurice T Knibbs 02 Sep 1896 House Decorator Married
Margaret Knibbs 30 Jan 1904 Unpaid Domestic Duties Married
Rose I Cryer 08 May 1900 Single
Gladys MRands 14 May 1910 Single
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On 11 January 1949, Maurice left Southampton, bound for Halifax, Nova Scotia on the Cunard White Star Liner "Aquitania".
The passenger list gave the following details:
Maurice Knibbs 53 Painter - 20 Chestnut Avenue, Langley Road, Slough, Berkshire
Margaret Knibbs 44 Housewife Same address
Leslie Knibbs 24 Clerk Same address
John Knibbs 5 Scholar Same Address

NOTE:
It's interesting to note that there was another Knibbs family sailing on the very same ship. So far as I'm aware there's no connection between Maurice's family and the others so it was just a major coincidence to have two Knibbs families (three of them called Leslie) travelling together. They were:
Leslie Knibbs 26 Grocery - Hut 15, Site 4, Alconbury, Huntingdonshire
Wenonah Knibbs 25 Housewife Same Address
Roland Knibbs 2 Child Same Address
Leslie Knibbs 10 months Child Same Address

Leslie Roland Knibbs was born q3/1922 in Kettering District, Northamptonshire, England, son of a Francis Sidney Knibbs (1896-1970) and Frances Elizabeth Furnell (1895-1972). Winona Scott was born 29 Nov 1923 in Sault St Marie, Ontario, Canada. She died 30 Jan 1996 in Hamilton, Ontario, Canada.
Leslie and Wenonah L Scott were married at Hamilton Ontario in 1944. Leslie was a navigator in the RAF. He met Wenona when he was stationed at Mount Hope Air Base south of Hamilton. Wenona was a recruiting officer in Hamilton. Their son Roland was born in Kettering, Northamptonshire in October 1946, but the yoinger son, Leslie, was born in Huntingdonshire in 1948.
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Maurice died in Saanich, Vancouver Island, British Columbia:

Vital Event Death Registration
Name: Maurice Theodore Knibbs
Event Date: 1963 11 18 (Yr/Mo/Day)
Age: 66
Gender: male
Event Place: Saanich
Reg. Number: 1963-09-013682
B.C. Archives Microfilm Number: B13264
GSU Microfilm Number: 2033687

He's buried at Royal Oak Burial Park (Section M) Victoria, Falaise Drive, Vancouver Island, British Columbia, Canada.
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I'm told that KNIBBS CRESCENT and KNIBBS PLACE in Saanich, British Columbia are named after Maurice, but I've never establish why.
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Our gratitude goes to the members and volunteers at Find A Grave web site for recording the details, in memory of Maurice.

We see Margaret's parents in 1901, living at Stoke Poges, Buckinghamshire:
Geo Freeman Head Mar 49 House Painter England
Mary Ann Freeman Wife 31 England
Florence Freeman Daur 2 Stoke Poges
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We see Margaret in 1911 living at 12 Stoke Gardens, Slough, Buckinghamshire:
George Freeman Head Mar 60 House Painter Hampstead London
Mary Ann Freeman Wife Mar (12 years) 40 High Wycombe Bucks
Florence Freeman Daur 10 School Slough Bucks
George Freeman Son 9 School Stoke Poges Bucks
Margaret Freeman Daur 7 School Stoke Poges Bucks
Kathleen Freeman Daur 4 Slough Bucks
Jack Freeman Son 2 Sloiugh Bucks
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Margaret married Maurice in 1923.
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We see margaret living at Slough District, Berkshire, England at the time of the 1939 Register.
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Margaret died in Kelowna, Britihs Columbia:

Vital Event Death Registration
Name: Margaret Knibbs
Event Date: 1985 2 6 (Yr/Mo/Day)
Age: 81
Gender: female
Event Place: Kelowna
Reg. Number: 1985-09-002820
B.C. Archives Microfilm Number: B16571
GSU Microfilm Number: 1358011
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Our gratitude goes to the members and volunteers at Find A Grave web site for recording the details, in memory of Margaret.

Margaret is buried at Kelowna Memorial Park Cemetery, Kelowna, British Columbia, Canada, Plot: D 1 110 23