Aerate Sandstone Lawn?

Hi - please bare with me as there is some background to this story.
My house (in the UK) is built on very sandy soil. Every time I dig over the borders, I pull out lumps of sandstone sometimes bigger than house bricks. 3 years ago I laid new turf, front and back. In preparation I dug over the entire site removing all sandstone / building material. I dug in some compost and applied some growmore, then prepared the area and laid the turf.
For the first year or so the lawns were great. As the years have gone by, the front lawn especially (which spends most time in the sun) now has brown and completely bare patches. I always apply weed and feed in the spring and use a lawn rake and apply autumn feed in the autumn.
Having read about the problems caused by compaction, I tried to aerate the lawn with a garden fork, however the ground is so hard that this is impractical. I decided that a power drill and 45cm masonry bit would be more appropriate. Having tested this on a small area, I can see that in the brown/bare areas I'm pulling up sandstone through the flutes of the drill and yet the green areas are much easier to 'drill' and remove soil.
My question is; given that it's beyond what I'm prepared to do to completely remove the lawns and replace them, would anyone like to comment on whether I would be wasting my time aerating the entire lawns in this way, when there is obvious sandstone underneath?
The problem is too acute to simple part the turf and lift out the offending objects.
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I can't imagine when aeration would be a bad thing unless done while grass is dormant. AERation is good to do when the grass is growing vigorously.
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On Thu, 10 Aug 2006 07:56:47 -0700, JuEm531 wrote:

Good day. If it was my job to do, I would aerate and then apply compost of some sort. I would suggest that you use a core aerator that will leave plugs holes and dump the plugs on the lawn. I would also rake up the plugs and use them somewhere else. Overlay the lawn area with your compost at 1/2 inch (1.5 cm) deep and rake it into the plug holes.
I would suggest that you rent an aerator. Ask for damage insurance 80) Make sure that the lawn is moist before aeration so the core tines enter the soil easier.
Good luck. -- http://www.resources.ywgc.com
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