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Yeah I plan on getting a mixer as I have 2 walls to repair and a shed base to pour, unfortunately 2nd hand ones seem to go like hotcakes around here. I do need to get a laser or water level so I can check my levels properly. Pretty sure it's as deep as it's needs to be in the middle but there's plenty of gravel/soil/rubble left at the back and down the side path that needs moving and the less I have to cart through the house the better.
Thanks for all the advice by the way, this is definitely the most involved DIY project that I've ever planned so it has a lot of potential for me to fuck it up without guidance!
Polygon
@ColinTheBald
OK, not easy to see from your pictures, I would really need to look at the site. Are you sure you need the base to protrude 50mm? The finished surface will be 50mm approx above the base surface. If you need bendy shuttering at only 50mm depth, hardboard strips formed around pegs made of cut-down reinforcing rod will do the job, the interior pressure of the concrete will hold them in place.
Presuming you're looking at the 2.84m circle, you'll need about 1.4 tons of concrete. This could be knocked up by hand in a day. You wouldn't enjoy the process, I would use a mixer!