something on with my new turf

I had new turf put down about two weeks ago and everything seemed to be going fine. I've had the odd wheat coloured patches occur, which i expected. but the last couple of days there has been a darkish green/blue colour developing on one half of the garden I'm not too sure what this is? is this the start of it dying? or may be water logging? Any advice greatly appreciated, thanks

 

Without seeing it it's difficult to say but it's usually a sign of the opposite, i.e the lawn requires more water.

Is there anything different about the half of the lawn with colouring? Was all the ground prepared in the same manner? Is there a tree or any plant which could be taking moisture?