No great urgency. Quite busy lately, so no time to set up or do any studio shooting. Thanks for the offer. Will probably also want to borrow your flash with it, if possible, so that I can try a two-flash setup.
I've built a couple of diffusion panels. At the moment I use a PC cord to trigger off a flash and a slave trigger on the other flash. The problem is that I have to set exposure manually, by trial and error. I want to see if using E-TTL with the ST-E2 and Canon flashes will be much better.