Mine developed yellow spots about this time last year and I treated for grubs.Bye bye yellow spots. You might want to take a plug to a nursery.

We use weed n feed every spring and every fall for our grass. We've tried off brands, but not with much luck. It is a little pricey, but it makes a world of difference

What type of grass do you have, Jimmys? If you have tall fescue, which is common in your area, it naturally goes through a period of dormancy when it is hot and dry in the summer, and it takes a lot of water to counteract that. What did you spray?

To keep fescue reasonably happy in the heat of summer it needs a measured inch of water applied once per week.

garden chafer is common in Great Britain...not so much here. Did you find white grubs in the soil?

Wondering what type of grass you have? Here, the zoysia has taken a major beating this year and last. Brown Patch fungus is rampant.

pull up a plug of the grass and if there are no roots, you have grubs, don't use a multipurpose bug killer, get grub killer at IFA