Hi everyone really after some advice i have been given planning permission for my side extension and need to move the current retaining wall which is 1.5m X 10M long and is constructed with a double course brick further back about 4.5m to make the new wall 2m X 10m is it possible to dig out all soil with a digger without it all falling in i will be doing this in the summer when its dry and will have the new wall built straight away any ideas of other retaining wall methods,and do i need to apply for building regs as i am only going to get the wall sorted out this year and start the extension next year,many thanks in advance