This car is the Brooklands record breaking Horton K3 single seater, It spent the war in Singapore then in Japanese hands.which would seem to contradict the the story that it was used as the basis for the EX 135 record car (pictured below with Goldie Gardner's EX 181)
i don't know who owns it now but it did belong to the late Mike Hawke MGCC Chairman who died in 2010.
It began life as a normal K3 until it was modified by R.R. Jackson of Brooklands fame for R.T. Horton. It was an off-set single-seater which was regularly performing well in 1935. Goldie brought the Horton car in 1936 and thus began his career of serious record breaking. On the August Bank Holiday meeting he established a new Class G Outer Ciruit lap record of 124.4 m.p.h..
More records were attempted the next day but these were later disqualified due to faulty timing equipment, but an excellent average was achieved of 119 m.p.h.. This news did not go un-noticed and was brought to the attention of Cecil Kimber (then head of M.G.) who agreed to provide some factory assistance in preparing the car for the 1937 season. Robin Jackson agreed to continue his work on engine improvements. These included a new bronze cylinder head, new valves and camshaft, and building a larger Powerplus supercharger.
In June 1937, the rebuilt car went with Goldie to the new autobahn which had just been built outside Frankfurt in Germany, where a record-breaking week was being held. Despite a misfire, new Class G records were set for the Mile and Kilometre at above 142 m.p.h..
Subsequently at Monthlery, more records were set with the 5 kilometres at 130.52 m.p.h., 5 Miles at 129.98 m.p.h., 10 Kilometres at 129.79 m.p.h. and 50 Kilometres at 123.21 m.p.h..
In October, again in Frankfurt, the car came out once more, showing distinct differences from its earlier form. The car was much cleaned up externally and now used a Zoller blower instead of the Powerplus unit.
The changes obviously worked and the new Mile and Kilometre records were set at 148 m.p.h..