Thanks again for your replies both. In response to your question of why Kelvin the answer is yes, to make it more usable. We have 2 young children so would love to flatten a large enough area to get some garden play sets, paddling pools, tables and chairs. It wouldn’t be as much of an issue if it was just me and my partner but would like the flat area for the children. I think flattening the majority and leaving the bank to the highest point sounds like my best bet at the moment. Access for a mini digger is ok so that will take a lot of the effort out of removing the soil.