Profpointy
Legendary Member
Halve (or even eliminate entirely) the material costs by digging a huge hole. Pile the excavated material next to the hole, then ride from the bottom of the hole to to top of the pile. No need for imported material. You can thank me later.
Edit: Damn, beaten to it by Drago.
You can do better than that. Dig the hole twice as deep, sell all the mud for the £30 a ton Mike above quoted and you can fund the entire project.