in response to a request for ideas on making a path i though id offer these ideas if you have any more please add to it....i will discuss the foundations in a while
paving slabs from freecycle if you can get them ,also you can get loads of bricks and lay them down end to end in any patern you like .i think a herring bone one really adds to the old world charm.
concrete is expensive and may need special permission costs would include the edging board unless you skip dived them the labour is intense also
crushed rubble again needs side boarding to hold it in
another idea is using side boarding with a large quantity of council bark mulch i use this in my garden .the chucks love it as well and its easily replaced .the council usually need to get rid of it and often ( as mine does ) deliver it for a small fee
grass lawning . fine if you dont run up and down it with barrows to much , needs cutting once a fortnight
planking runways . take a pair of 10 ft long pieces of 2x4 posts and nail 5 inch by 1 inch or more thick planks across them , level each end with a plank temporarily nailed . now continue nailing more planks with a small gap of about an inch inbetween each plank all the way down the posts .then make enough of these sections to go the length of the allotment treat with preservative yearly ...( i use old oil and white spirit . werks for me )
think thats it for me for now on that bit .
foundations need to be levelled for brick and paving slabs you really need to have edging strips also to retain the material and i would suggest using a sand foundation especially with the bricks .the slabs can lay on soil if needed
the wooden runways could be layed on a sand bed to allow drainage
the other ideas suggested will need no foundations