The most recent DVSA MOT test for this 1959 Triumph Twenty One was conducted on 21 August 2018, and the vehicle passed with no defects or advisories recorded. Across the five documented test entries between 2006 and 2018, every examination has resulted in a clean pass with no recorded advisories, advisories relating to wear items, or failure points. While the absence of advisories is a positive indicator of the condition presented at test, it is worth noting that the MOT testing regime does not comprehensively assess corrosion of structural components on vehicles of this vintage, nor does it cover many age-related degradation issues such as perished rubber or fluid condition. The overall trend therefore suggests the vehicle has been maintained to a roadworthy standard at the point of each test, although prospective buyers must look beyond the digital record to fully evaluate mechanical condition.
The recorded mileage of 31,113 miles over approximately 67 years equates to an annual average of around 464 miles, which is exceptionally low and strongly suggests long periods of standing rather than regular use. Such low usage can be as mechanically detrimental as high mileage in certain respects, particularly for a vehicle of this age where original specification components, gaskets, seals, and flexible elements are approaching the limits of their service life regardless of mileage. The recorded mileage history also displays significant gaps between tests, including a notable seven-year interval between 2008 and 2015, during which the vehicle may have been laid up. Extended standing periods typically lead to internal corrosion of brake cylinders, seizure of caliper pistons, oxidation of fuel system components, and drying of hydraulic fluid, all of which require proactive attention.
Given the advanced age of this Triumph and the low annual mileage, a prospective buyer should undertake a thorough physical inspection beyond the MOT record. Tyres of this age are highly susceptible to sidewall perishing and cracking even with adequate tread depth, and any rubber fitted more than five or six years ago should be replaced on safety grounds regardless of wear. The braking system warrants particular scrutiny: brake drums and any discs should be examined for severe corrosion pitting, and the handbrake mechanism should be tested for effectiveness after the vehicle has been stood. Caliper and wheel cylinder sliding surfaces may be corroded, leading to binding, which manifests as uneven braking or the vehicle pulling to one side under application. Flexible brake hoses, fuel lines, and the rubber portions of the suspension and steering components should all be inspected for perishing and cracking, as original-style rubber components degrade with calendar age.
Further attention should be directed toward the cooling system, where hoses, gaskets, and the radiator are all likely to be well beyond their intended service life. Given that classic vehicles of this era frequently utilise traditional coolant formulations, a complete flush and refill with modern inhibitor-containing coolant is advisable, along with inspection of the water pump, thermostat housing, and core plugs for signs of leakage. The 6-volt or 12-volt electrical system, depending on specification, should be checked carefully, as battery condition deteriorates with standing time and original wiring insulation becomes brittle. Engine oil, gearbox oil, differential lubricant, and brake fluid should all be regarded as time-expired rather than mileage-expired and a full fluid service conducted prior to regular use. The final drive and transmission should be inspected for signs of oil leakage from aged gaskets, and the condition of the original leather or vinyl interior, chrome trim, and body seams should be examined for evidence of water ingress, particularly given the decades of standing. Verification of any service history stamps and corroboration with a marque specialist inspection would provide the strongest basis for confident purchase.