Rotten Lawn

my Lawn seems to be rotten and wondered if someone can advise me how to recover the lawn.
In the winter the lown produce mushrooms which I pull out. Throughout the year most of the grass is yellowish colour. These grass easily come off but it seems it spread so quickly.
Can anyone help?
0
Posts
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
To check your soil type see here.