Sorry another question from me. I am going to put gravel over my entire garden, which is approx 18 x 18 foot of nothing atm. I dug it up last year and made it flat(or so I thought) for a trampoline. Trampoline has now gone. Garden needs a bit of work to make it flat, not a problem I can do that. There are weeds inc stinging nettles growing round the edges. I am going to dig these out. When it's all nice and flat I am putting down weed control fabric, and putting 2 tonnes of gravel over it. Is there anything else I need to do before the gravel? It's costing a lot and I want to get it right. Thanks