woodsmith
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This sort of construction was quite common, the blocks are often lightweight blocks but not always and as long as the floor is sound it shouldn't give you any problems. It's good to be aware of it though so if you ever have any work done they don't weaken the floor by cutting any of it away to lay pipes or wiring for instance.
As long as you haven't noticed any cracks or gaps appearing I would not be worried, lots of houses were built in the same way.
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