On 11 May, 19:49, NoSpam wrote:
A couple of years ago we stripped and levelled one area of lawn and
about a year ago did the same to a second one. In all there's probably
an additional 20T of top-soil compared to when we started, from two
different sources.
Both areas were allowed to settle and then thoroughly seeded but the
grass grew in patches rather than evenly and the overall quality of lawn
is pretty awful. The first area also has soft bumps where the grass has
grown.

Any lawn experts out there? What's going on and how can I fix it?

Dave

Are you sure the birds did not view your seeding efforts as one giant
banquet?

The only other thing I can think of is the quality of your so-called
'topsoil', some unscrupulous traders may mix all sorts of stuff and
call it topsoil. Mushroom compost is one that springs to mind, and you
might have difficulty getting anything to grow on that.