A building in London Road, between the Kings Arms pub and Sibthorpe Road.
In this 1952 OS map, numbers 250 and 252 are south of 248 on the west side of London Road, opposite the Buck’s Head pub.
This clip of Mitcham ‘High Street’ as was called then, is from around 1900, and shows the left the old Kings Arms pub. Numbers 250 and 252 are to the left of the Oil Colour Stores’ that has ‘No. 8’ between the windows on the first floor.
From the 1891 directory (the shops were numbered from 1 going north):
1, Henry COLLBRAN, butcher
2, S.E. BURTON, stationer
3, Charles GOULD, The Kings’ Arms Public House
4, Mrs H. LACK, draper
5, John CUMMINGS, greengrocer
6, Joseph COOK, butcher
7, T.P. SHEPPARD, grocer
8, William BARTER, grocer
9, George Joseph DALE, news agent
—
— here is Sibthorpe Road
—
10, James MOULAND, Pawnbroker
11, William Henry JENNER, ironmonger
12, Charles MACRO, hair dresser
13, C. SAUNDERS & Co., grocers
14, William COURT, baker
15, MOULAND & BENNETT, Watchmakers
Hence numbers 6 and 7 High Street are now 252 and 250 London Road.
A photo from 1895 shows it looking north.
The 1925 street directory still referred to the High Street. In 1926/7 London Road was renumbered.
Charles A. HUDSON, Kings Arms hotel
2 & 4, H. LACK, draper
5, John CUMMINGS, fruiterer
6, G. DUTRIEZ, butcher
7, W.H. FIELD & Son, wine merchant
8, E. & A.M., grocers
9, A.E. DALE, news agent
—
— here is Sibthorpe Road
—
10 & 11, W.J. HYDE, pawnbroker
12, H. MACRO, hair dresser
13, Miss H.M. HICKS, milliner
14, M. HICKS & Sons, bakers
15, G.H. HUDSON, watch maker
Number 6, now 252, was a butchers shop in 1891. In 1939 it was occupied by A. SPICER, as shown in this ad:

1939 ad
In the 1954 phone directory, it was occupied by HEARN & Sons, Family Butchers.
Number 7, now 250, was a wine merchants as shown in the 1925 directory. In the 1930 commercial directory it was occupied by Horace Albert Paine.