Like me in my 93 1840cc.
It was fine…bar the increased din and always passed MOT gasses…legally sans CAT… under the prescribed import criteria.
Prepared to be “schooled” on it even aged 69 but I’ve never in 15 years with the marque read or heard of the need to retune a Mk1. Funny old world…maybe I missed it.
Anyway…that’s me done now. 
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