Today I managed to clear the remainder of (most of) the clay from a small bed (about 1.5m x 3m) and turn the soil down to about 20cm deep. It has taken me about 3 or 4 afternoons... stubborn stuff. Today I bought a couple of bags of aged horse manure from a local horse owner, dug it in, and watered it.
Tomorrow I intend to cover it with some grass clippings from the top of the compost bin, maybe dig those in a bit, and find check out some green mulch to sow. Once it has grown, I'll till it in, dig a bit deeper (to maybe 40cm), get the soil tested, make any adjustments needed, and start growing.
Oh, and the rest of the beds need doing, too. It's the hardest physical labour I've done in a while!