Posted: 19/05/2014 at 06:34
Like i said...looking to RAISE the lawn and then installation of fake turf................
Dave Morgan understood your question perfectly and he explained what will happen if the drainage isn't sorted out - the water to make the mud will come from below - the water table is obviously near the surface and just putting soil on top will not solve your problem it will make it worse.
If your neighbours' flagging has not been properly installed with drainage it is probably contributing to the flooding in your garden.
I have seen 'astroturf' lifted because of a rising water table and float away in flooding. It will be worthwhile doing the preparation properly and as Mike says,you could put in shingle and sand which will drainage.
However, I would seek advice from a specialist company regarding laying the turf as you obviously have drainage problems.