Replacing bushes with lawn...

Hi,
I have a question about topsoil / large section lawn repairs.
I've bought my first house and I know nothing about gardening. The man who used to live there left it to grow wild for years and years.
Its a reasonably large garden (corner plot) and I have removed three decent sized bushes. I dug out the turf all around the area where the bushes were. Some of the turf was dead, like moondust, and in other places it looked insect/disease ridden so I just got rid of it all (possibly I got a bit carried away).
So I've now got three big holes in my lawn 2"-3" deep. To give you an idea of size I must have taken 30 rubble sacks of turf and soil to the tip. These areas rapidly fill with weeds.
My first decision was whether to place down pre-grown turf or to put down a new layer of soil and reseed it. I'm going for the reseeding option.
My question now is whether or not to buy fresh topsoil (from B&Q probably)? The alternative is that I have a flower bed that has been dug up by one of those bad ass rotovators and I have bags of soil - but my concern is that it's full of chopped up roots/twigs...
For the top layer I'm thinking I should go for fresh topsoil?
--
parkinpants


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On Wed, 10 Oct 2012 14:21:12 +0000, parkinpants

Throwing away the soil and sod that was already there was a big mistake, you should have tilled it all with added organic matter, now you'll need to replace that soil.
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