Garden flooring

Evening all,
We recently moved into a house that is a renovated old brewery, and have started work on the garden this week. It was mostly covered with stone chips but we were not keen on this as they are not comfortable to sit out on so thought we would lay a small lawn. However, removing the stones we have found it is basically solid clay and there is also a manhole cover, we'd need a good layer of topsoil for a lawn to survive and digging it out isn't an option.
So, really looking for any ideas for what we can cover the surface with. We don't have a huge budget to have it paved, or decked at the moment. I have seen some click together decking tiles at Ikea but I'm not sure how sturdy they would be for kids to play on.


The space is about 2.7m x 4m and there is a step down to a shady area where we are happy to leave the stone chips.
Any creative, budget friendly ideas?
Thank you!
We recently moved into a house that is a renovated old brewery, and have started work on the garden this week. It was mostly covered with stone chips but we were not keen on this as they are not comfortable to sit out on so thought we would lay a small lawn. However, removing the stones we have found it is basically solid clay and there is also a manhole cover, we'd need a good layer of topsoil for a lawn to survive and digging it out isn't an option.
So, really looking for any ideas for what we can cover the surface with. We don't have a huge budget to have it paved, or decked at the moment. I have seen some click together decking tiles at Ikea but I'm not sure how sturdy they would be for kids to play on.


The space is about 2.7m x 4m and there is a step down to a shady area where we are happy to leave the stone chips.
Any creative, budget friendly ideas?
Thank you!
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https://www.diy.com/departments/flooring-tiling/tiles/DIY566460.cat?Location=Outdoor
The only other thing l can think of at this time of night is playbark, or possibly artificial grass. An anathema on a gardening forum, but in view of what you have to deal with and budget constraints, it might be worth considering. You could try Freecyle or Facebook marketplace perhaps.
My granddaughter got some from Facewotsit to use for her dogs to run on instead of bringing mud into her new build house. Again as a temporary measure.