Posted: 26/04/2014 at 10:43
Is this gravel Wills? or larger stones?
I suggest that you google top-soil and compost; see which is the cheapest and have quite a lot delivered. I would also add well rotted horse manure. In my raised veg bed I use the bought, spent compost from growing last year's tomatoes. I get the 125 litre bags of Verve from B&Q, as a wrinkly if I buy on a Wednesday I can use a pensioner's discount card and get 10% off.
Hope this helps