Laburnum Park was the name used for the housing development on the former Mitcham Stadium site. It may have been the name given by Wates Ltd, the developers, who bought the site in 1955.
In the Mitcham Borough council minutes of 14th June, 1956, the road names were recommended:

From OpenStreetMap, 2018
Newspaper Items
Norwood News, 15th May, 1959, via the British Newspaper Archives.

MITCHAM, Laburnum Park Estate – Two-year old luxury, modern, terrace house, three bdrms., bthrm., open plan downstairs, central heating, Marley floor, large kit., garage; £3,300 freehold – Box N0790, News, Upper Norwood.
Norwood News, 29th April, 1960, via the British Newspaper Archives.

Members of the Laburnum Park Estate Residents’ Association, Mitcham, presented one of their neighbours – England and Surrey Cricketer Ken Barrington – with a golf trolley at a dance held in his honour at the White Hart Hotel, Mitcham, on Friday. Pictured with Ken, who recently returned from the West Indies with the M.C.C., are officials of the association and Tooting and Mitcham players Brian Bennett, Paddy Hasty and Ted Murphy, who were among the guests.