An mot tester will never check things like speed ratings or specific manufacturers on the writing on the tyres. Only things they do check are

Any lumps in the side wall

Splits in the side wall where cords are visible

Tread wear on centre 3/4 of tyre ( above 1.6mm)

Matching size tyres on same axle. Must be same size, width and wall height

Directional tyres fitted correctly.

Punctures will be pass and advise unless in a dangerous place. eg sidewall or edge or tread.

Maybe more im not sure, someone will confirm! but if an mot tester ever fails for speed ratings then hes just a dick imo