I'm glad to say that clay soil really does get better and you will grow to be graeteful of it when its hot weather(like today, huray!), I used to be really jealous of my mums easy to dig sandy soil, but not now, as her veg needs constant watering.
I started growing things at the last minute in something that more closely resembled the moon than a veg plot, now, 3 years later it's beginning to look like soil I could show to an oldschool lottie guru!
I tip onto it every spare bit of potting compost, as well as adding as much horse poo as I can under black plastic over the winter. Then when it's too cold to plant out but I'm desperate to get gardening, I chuck on a couple of bags of sand, go mad with the hoe, a little nearly everyday for weeks, it worked!