I´ll tell you who Mathieson is. In this case I´ll use Cyril Posthumus as a source, hope you do not mind
Born in Glasgow in 1908, 'Taso' Mathieson began racing at Brooklands in a one-make Lagonda meeting in 1930, and had his first victory at the track in the Norfolk Senior Mountain Handicap in 1932, driving a blown 2-3-litre OM. He had three other wins in 1932 and 1933 with Bugattis, and set a new Mountain Circuit lap record for 2-litre cars at 72.15mph (116.11 kph). Indifferent health kept him out of racing from 1934, and his Bugatti was driven on several occasions by Chris Staniland. By 1938, however, 'Taso' was back, taking 3rd place at Chimay with a Bugatti Type 57S. He drove at Le Mans in 1938 and 1939, in a 4-litre Talbot with F. E. Clifford in 1938 and a 4-5-litre Talbot with Luigi Chinetti in 1939, but in both events mechanical trouble eliminated them.
After the war 'Taso' became the first Briton to race again on the Continent, acquiring an ex-Birkin 3-litre Maserati which he drove during the 1946 season. In 1950 he bought a 2-litre Le Mans Frazer Nash with which he scored a class victory at Le Mans that year (with Dickie Stoop). In the 1951 Targa Florio he was 3rd in the Frazer Nash when the fan belt broke. He was 2nd at Senigallia and 4th at Oporto, and in 1952 he bought the ex-Baird 2-3-litre Ferrari which he drove to 6th place in the Targa Florio, winning the 3-litre class. In 1953 he drove a 2-litre sports Maserati with which he won his class at Roubaix and Bressuire. His last race was at Brands Hatch in 1955 with a San Remo Maserati, after which he concentrated on writing and building up his magnificent collection of photographs. He is the author of a number of authoritative books, including 'Grand Prix Racing 1906-1914' (of which, by the way, I bough a copy last month at Goodwood at an excellent price!)
(Ten-Tenths Note - Source Unverified although accept it as Posthumous; the issue is whether this is a direct quote (copyright?) or in the poster's own words? - JT