Well, if you cut it and make it tidy, then you will have followed the agreement. If they say "there's weeds" just say "they were there when we moved in". Then they will have to prove that the lawn was different, and without a photograph with a recent timestamp, they won't have a leg to stand on.
Thanks for your advice. I would not be surprised if the landlord has pics with a fake timestamp on them. He has a few properties so he knows what he is doing, when he came in the inspect the property last week he was very critical of everything and he obviously knows how to screw the tennant. I can see where he has many valid points. The one i know he is lying is with the carpets, they are a light oatmeal cream carpets, they were grubby in the hall, living room, bedroom, stairs and landing. To make the place nice i paid to get them professionally cleaned and i informed him i had this done. Last week he came in to the house and every room he is saying the carpets need cleaning, this is bull as they are cleaner than they were when i moved in. He claims the carpets were cleaned before i moved in and he has pics to prove this. So if this is the case then they are fake because the carpets were very grubby. Oh the joys of renting.
I have asked for a copy of the intinery and what things he thinks i should attend to before i leave.