I would be tempted to get the stagnant water checked out by the Environmental Health people from the local council. If it smells, it could be coming from the drains.
The land drains should help, but the soil may still be of a poor quality. Ideally you want 100mm topsoil, not compacted sub-soil and builders' rubble. No grass will surive on this for long and it won't drain well either.
I would get a landscape gardener in to get a professional opinion.
Hope this helps
Tony



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