Was the topsoil firmed down well before laying the turf? (usually done by treading all over it with your heels then raking lightly to level the surface). If not then it will settle over time as it gets walked on, rained on etc. If that's what happened, I think I would leave it over the winter to see how much it settles, then level it out. For minor hollows you can add topsoil a little at a time so that the grass can grow through it. Otherwise you can peel back the turf on the hollows and add topsoil underneath.
No Jenny, we literally just put the top soil down and raked it. As you can imagine it was completely uneven 🤦🏻♀️ it's raining really heavy today so hopefully as you say it may settle over time. If not we'll have quite a job next spring! Thanks for the link, I'll take a look ,👍
I think I assumed that the "help" had been involved or at least seen it after the topsoil was put down because @carebear82.cc said that they'd laid one strip of turf, so they would have had an opportunity to check what had been done. Apologies if I misunderstood that.
Doncaster, South Yorkshire. Soil type: sandy, well-drained
Our help didn't flatten the soil as you've described either. I think he completely underestimated the job and with it being on a Saturday, he was eager to finish up. He didn't return the next day as promised so it was a case of do what you can really. You live and you learn though. We might make good landscapers after all of this!
If it's only been down a week it probably hasn't started rooting yet and, if it has, it will be minimal. I would be tempted to lift it, heel-in / roll the soil level, rake and re-lay. It's a pain but I fear you will be chasing this forever otherwise and you'll never be happy with the result.
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I live in west central Scotland - not where that photo is...
I live in west central Scotland - not where that photo is...