I would email the experts but hopefully my gardening colleagues can solve this issue.
I laid a new lawn over 2 months ago, and followed all the rules, not standing on it for the required time, watering it for a full month etc etc. On my first cut i took it to a height of 30cm, the second and third 20cm. Even though it looks like it is flourishing, on cutting it, i notice that there are patches where it has died of, which is unsightly to say the least. I have no idea why this has happened, is it the soil which i filtered so it was extremely fine, do i need to just add lawn feed to encourage growth, aireate the soil or is it because of the amount of rain we have had.?