Thanks for the advice Ed, that’s the beauty of gardening you learn from your mistakes and there’s always next Year. I’ve struck it lucky this time with a very good deal on some good quality potting compost.
I'll keep your cactus mix in mind but I have to admit that I had never heard of it before. As you live in California my initial thought was that they were some type of granules derived from a dead cactus, doesn’t a cactus store water? And what good is it to me no deserts in the UK. Two minutes later with the aid of Google DOH!!
Oh Yea I get what you mean.
I can only add, I’m still learning and I’ve never tried to grow a cactus, well not yet.