Crack/Split in tyre tread - MOT failure?

[maxp]

I noticed today that in one of the tread grooves of my front left tyre, the rubber has a slight crack in it, going all the way round.

Is this an MOT failure? The tyres are a couple of years old and otherwise have a decent amount of tread left.

[cagedmini]

I work for a much 'loved' tyre fitting place and sounds like it might be ok if no cords are showing or canvas, but MOT testers can be picky..

[GC8]

Id expect an advisory, if they notice. Of course, if they notice and its deep enough to expose cord, then itll fail.

[Frances The Mute]

Advisory.

To fail, the damage would need to be 25mm in length (or 10% of the section width, whichever is greater) and exposing the tyre structure i.e, cords, bandages, belt package etc.

Do you have a picture of the affected area?