Grass ALWAYS comes back, you won't have ruined it. It's hard to guess what's causing it but pop a summer feed on (not weed/feed/mosskill) and water well. Are you sure it's not red thread?
I’m 100% sure it’s not a disease. It only went like this last week or so. And we have had no rain so I put it down to that. Also looked like this right have a cut with a blade I should of sharpened. So putting it down to needing some food and a rubbish blunt blade
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The most useful thing you can do to that lawn this weekend is to find a comfy deckchair and a 🍺 and relax on the grass 😎
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.