If you want an easy bracket for a leg this one doesn't take too long to make.
Get some rhs tube that will fit the right size leg and weld some angle iron to the side for a mounting bracket.
Then drill a hole in the side of the rhs and weld a nut over the hole.
Fit a bolt in the nut and weld on a big nail for some leverage. And grind off the sharp bit on the nail.
I can't remember where you are mate, but if you are near croydon you could pop over and use my welder if you don't have one.
Or most mens sheds will have one.