We moved in our house 4 years ago. The previous owner put some turf in the back garden which is quite wet and often in the shade. A lot of moss has grown and the grass has been awful for a couple of years. I decided to dig it up to see what's going on and discovered that the turf had been laid on a membrane and almost no top soil. That will explain my problem. So I think I need to get rid of this membrane, flatten the surface but I don't know if I should put a new turf on it and re-use the one I just lifted. It would be a pain to have to get some new turf as I would cost quite a bit of money but if the old one won't work, I will be happy to get new one. Any advice?