Kroma wrote:
We moved in to our house just over a year ago. Parts of the garden were
overgrown including 2 bushed which had overgrown on to the lawn and killed
it.
I added some soil and grass seed and it grew back nicely.
However, after all the recent rain the patches seem to have sunken by about
half an inch.
Can I just whack some topsoil on top and hope the grass will grow through it
or should I dig it up and put topsoil underneath (then replace the turf of
course)?

Putting topsoil on it is not a great idea, unless you add some grass
seed to the mix. I'd get a bag of silver sand, and some compost, mix
that up, add some seed, then distribute it over the depression, then run
a roller over it.
It is also possible to peel back a sod, and put a bit of soil
undernetah, but that is too much hard work for a dip of half an inch.
Alan.
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