Lawn weed/feed

[Kingfishersperch]

I have had a new lawn laid earlier this year.
I used to have a lawn care man come and look after the old lawn but he’s disappeared/moved away so I thought I’d give it a go myself.

Does anyone have recommendations for lawn weed/feed/fertiliser? Maybe one similar to what the lawn care man would have used. I can borrow a scarifier etc when it needs doing. I just need to know the best stuff to purchase as a lot of patio weed killers are not very good and I don’t want to buy anything that is unlikely to work.

Just leave it to look after itself. All a lawn needs is to be mown occasionally. My lawn hasn't had any chemicals put on it since I moved here, its full of different grass types and wildflowers which means it's also full of insects.