Road that runs south from Tonstall Road, past Leather Close, St Marks Road, Barnard Road to end at Gaston Road.
The road name ‘Lammas’ comes from Lammas Day, as defined in Wikipedia:
Lammas Day (Anglo-Saxon hlaf-mas, “loaf-mass”), also known as Loaf Mass Day, is a Christian holiday celebrated on 1 August.
The road isn’t mentioned in the 1925 street directory, and part of it is shown on the 1932 map. Perhaps the houses were built from the end of the 1920s or 1930s.
The 1932 OS map shows the road as between Barnard Road and Gaston Road. The 1952 OS map shows the road in its extent as today.

1910 OS map. The footpath (F.P.), that runs to near the footbridge over the railway line, is now the boundary of the rear gardens on the east side of the road with the Laburnum housing estate.
News Articles
The newspaper articles below are via the British Newspaper Archive and are shown most recent first.
Norwood News – Friday 10 February 1961

Norwood News – Friday 10 February 1961
Image © Reach PLC. Image created courtesy of THE BRITISH LIBRARY BOARD.
A QUEEN ENTERS FOOTBALL CONTEST
FAIR-HAIRED Sandra Elkins (aged 17), Lammas Avenue, Mitcham, the 1960 Mitcham Carnival Queen, was among late entries for the Crystal Palace Football Queen competition.
Gretta Roadnight, Beulah Hill, Upper Norwood, and Penny Smith, Melrose Avenue, Mitcham, were other new competitors before the contest closed last week. This makes a total of 11 girls who will parade for the right to represent Palace in the area finals during a Supporters’ Club dance at Beckenham Baths tomorrow (Saturday). Judging will tale place at 9.30 p.m. by a panel of celebrities. This will include Kathleen Dale, President of the Surrey Women’s A.A.A. and a former Olympic hurdler; Cecil, her husband, president of Surrey A.A.A, and the Tooting and Mitcham F. C. P.T.I.; international boxer Tony Lewis, Streatham ice-hockey star Bob Ketcher and Ashley Deane, the Tooting model.
Croydon Times – Saturday 12 August 1939
HAWKER TELLS P.C. HE IS “LIKE HITLER”
Constable Did Not Agree
“You are like Hitler” is what a Mitcham hawker was alleged to have said to a policeman who stopped him for being drunk in charge of a barrow.
At Croydon County Police Court, on Tuesday, the Clerk asked the constable: “You do not agree, do you, that you are like Hitler?”
“No sir,” – replied the officer.
The constable, Thomas Redfern said he saw the defendant, William George Norman (59), Marian-road, Mitcham, zig-zagging about Lammas-avenue, Mitcham, on Saturday night, with a barrow. After turning into another road, he fell to the ground. He was taken into custody, and at the police station a doctor was called at defendant’s request.
Norman told the Court he was sorry, and said such a thing would not happen again. He was fined 2s. 6d. and told to pay 7s. 6d. doctor’s fee.
Birmingham Mail – Thursday 4th May 1939
GAS EXPLOSION
THREE MEN BURNED IN SCHOOL MISHAPThree men were burnt and a fourth gassed in an explosion at a new Surrey County Council school at Aragon Road, Morden, to-day. The four men, all employees of Wandsworth Gas Company, were connecting a three-inch main in a cellar meter room under the school. An electric light bulb burst and caused the explosion. Edward Roberts (aged 17), of Lammas Avenue, Mitcham, is in Sutton Hospital with burns to his face and arms. H. Driver and D. Morris were treated at St. Anthony’s Hospital, Cheam, for burns and then sent home. The fourth man, C. Weston, was given artificial respiration by ambulance men and also sent home. The gas supply was not connected, there was no fire and comparatively little damage was done to the building.
Shepton Mallet Journal – Friday 10th March 1939
TWO BABIES TOTAL 5 lb. 4 oz.
Two tiny babies, one a boy weighing 2 lb, 13 oz. and the other girl weighing 2 lb. 7 oz., have been born in the Longley Road Maternity Home, Tooting, London, S.W. Both babies are being kept in electrically heated cots and fed from a specially made miniature bottle. They are the smallest babies to have been born in the home, and their progress is stated to have been most satisfactory.
Mrs. Ella Seward, of Lammas Avenue, Mitcham, Surrey, mother of the boy, the wife of a window cleaner.
Mrs. Sani Coinage, of Woodbury Road, Tooting, mother of the girl, was formerly of Greek nationality. She met her husband, a non-commissioned officer in the Royal Sussex Regiment when he was stationed in Cyprus.
Maps are reproduced with the permission of the National Library of Scotland.