Tiling on a small subsidence crack - Tile Advice

[Tile kid]

I have been to quote a job today, 35m2 in a kitchen, but they have a slight diagonal crack in the floor which I believe to be a subsidence crack, is there anyway to get around this or stay away from the job?

Cheera

 

[Qwerty]

Depends on how much movement there has been/ likely to be in the future. How old is the property and any other signs of movement? A decoupling membrane usually safe for most minor cracks

 

[Tile kid]

Depends on how much movement there has been/ likely to be in the future. How old is the property and any other signs of movement? A decoupling membrane usually safe for most minor cracks

Property is about 20-30 years, this is the only known crack on the floor and none on the walls,

 

[Qwerty]

Any pics?