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I'd give a word of warning regarding the turf pile idea - if your allotment is the same as ours it's full of couch grass rather than just normal turf. If that's the case then a turf pile will just be a great way of propagating couch grass (at least it is for us). Does the grass have long and sometimes horizontal white roots about 1 to 1.5mm in diameter? If so it's couch.

I made a newbie mistake when we got our allotment a couple of years ago, taking the grass off the surface and not being terribly bothered about getting rid of all the roots (I assumed they would rot down) the result was a couple of beds which became completely unmanageable as the year went on (and are still problematical). I also made a turf pile which became a mass of perennial roots.

Now, don't get me started on bindweed...

managed to get a picture of my evil grassy lumps. the plot is mostly covered with these things.

Wow that is going to make one big heap of sods! My veggie patch had quite a lot of clumps of that (I call it paddock grass!) and we've now got a bank about 3 metres long by 2 metres wide and 1 high.

Looks like you're going to get some good exercise!

Couldn't tell from the photo, but if you're considering rotovating make sure there's no horsetail - or you'll be sorry

i don't thin i am going rotivate, due to marestale. Think i will spray the lot and strim again.
Here are some more pics of the work i did for a greenhouse base, and an area i cleared with
my mighty Azada.

Looks like what I understand is couch grass...My plot is covered with it to, you just need to be vigilant and keep on top of the weeding.... I don't find it as hardwork as ground elder, or creeping buttercup.