I intend to engage a labourer and direct him. First he has to dig out and remove a small tree, and all the soil from the planter (unless people think it's better to leave the soil inside whilst demolishing the brick walls.)
I looked online and see that some people prefer to use a massive hammer but I would prefer to hire or buy a tool as it seems safer than having someone swinging a massive hammer just feet away from the ground floor windows.
Thanks for any advice.
Pic attached,