garden slab

Do you think I can get away with not cementing the slabs down. I just want to do a sub base and a layer of sand to seat the slabs in... I have slabs vertically placed along the length on both side as a "retaining wall". Dug down about half away in the ground. The slabs will seat in between them...

I have a summer house located at the far end of my garden, connected to the main house by a decking walkway. Eitherside this walkway are large green spaces. Due to the decking deteriorating after 10 years, I'm planning to replace it with garden slabs. However, I'm aware that the slabs need to be...