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I think, as far as the MoT is concerned, it would be no problem. As you say this isn't a little 'back street garage' issuing the pass certificate, they must be sure of their position. It's the potential 'knock-on' issues, regarding the technical legalities that an insurer might use against you, should the unfortunate happen. Driving about no one is going to challenge you. You have an MoT pass in the 'eyes' of the ANPR cameras and there's no excessive noise or smoke.

Reading further on this subject it may not be as black and white as perhaps first thought.. From the DfT guidance notes on "Modifying your vehicle’s emissions: the legal, safety and health implications" "Under the Road Vehicles (Construction and Use) Regulations (Regulations 61(7) and 61A(3)) and the Road Traffic Act 1988 (Section 42) it is an offence to use on a road a vehicle which has been modified in such a way that it no longer complies with the air pollutant emissions standards it was designed to meet. The potential penalties are £1,000 for a car and £2,500 for a van, lorry or bus. Under the Road Traffic Act 1988 (Section 75) it is an offence to alter a vehicle in such a way that the use of the vehicle on a road would be unlawful. A person altering the vehicle (if they knew or believed that the vehicle would be used on the road) could be found guilty of an offence under the Act. Potential penalties are unlimited fines." The fact a hybrid doesn't require an emissions test doesn't mean it still complies with it's design standards? Does removing the CAT also render the vehicle non-compliant with it's Type Approval and so technically illegal for road use? What implication does the removal have on the vehicle's insurance status? The vehicle having been modified should be declared to one's insurer?

If one were to fall foul of a, let's say, ignorant tester, one could simply point him to the relevant sections of his (obviously pristine) copy of the manual?

Taken form the MoT Tester's manual (my highlighting) - As hybrids don not need the full catalyst test the inspector does not need to check for the presence of a factory fitted CAT. 8.2.1.1. Exhaust emission control equipment This inspection is only for vehicles that must have a full catalyst emissions test (disregarding the basic emissions test). You only need to check components that are visible and identifiable, such as catalytic converters, oxygen sensors, and exhaust gas recirculation valves. Defect Category (a) Emission control equipment fitted by the manufacturer: missing, obviously modified or obviously defective Major (b) An induction or exhaust leak that could affect emissions levels Major 8.2.1.2. Gaseous emissions You must inspect vehicles with spark ignition engines first used on or after 1 August 1975. You do not need to check: L category vehicles hybrid vehicles - with electric and combustion engines hydrogen fuel cell vehicles two-stroke engines - unless they are subject to a catalyst test https://www.gov.uk/guidance/mot-inspection-manual-for-private-passenger-and-light-commercial-vehicles/8-nuisance#section-8-2 Basic exhaust security and condition is checked in a different section but doesn't mention emission control equipment 6.1.2. Exhaust system You must check the exhaust system of all vehicles with an internal combustion engine, including hybrid vehicles. You need to assess the overall security of the exhaust system. One or more missing or defective exhaust mountings does not necessarily make the exhaust insecure. For exhaust noise assessment, see Section 8.1.1. For assessment of catalytic converters and diesel particulate filters, see Section 8.2. Defect Category (a) Exhaust system has a major leak or is insecure Major (b) Exhaust fumes: (i) entering cabin (ii) causing a danger to health of persons on board Major Dangerous https://www.gov.uk/guidance/mot-inspection-manual-for-private-passenger-and-light-commercial-vehicles/6-body-structure-and-attachments

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