Leeds City Transport 179, AUM422, was an AEC Regent originally with Roe H30/26R body of 1935, seen here after conversion to a tree lopper in 1955.
While photos of buses converted to tree loppers are not rare, it's unusual to see one actually at work with a top deck full of leaves and branches. Rescan from the original negative.
Photo taken by Paul Haywood, 1964, Street Lane, Moortown