Clearing the Plot - Part 3

So now we have two huge piles of "stuff" in the middle of the plot. What do we do with it?
Sieve it of course. I don't know how many tons of earth and associate vegetative matter we have, but one thing is clear, it's going to take weeks to get through it.

I managed to persuade the Other Half to come down to the plot today to help out. She's never done that before. It's only ever been me. But she was justifiably proud of the sieved pile she made. She did the sieving, I did the shovelling and carting away of the rubbish.
But there is still a long way to go.

It's about time we started on the getting the wood for the beds. But I have a nasty feeling that we will have to put down a plant root proof membrane to prevent the couch grass growing back in via the bits under the soil. We have taken off the topsoil, but there are still the odd roots showing through here and there. Guess I'll start Googling and see what other people suggest.