Ok thanks, I kept thinking that I had to try again with some of these foods again and again... I was just keen to introduce some of the veggies commonly found in commercial baby food jars - it seems that so many of these have things like tomatoes and dairy which I wanted to hold back on! But he doesn't seem to like the less-allergenic foods either, it would just be useful to be able to consider them 'introduced' for when we're out or travelling. He does seem to prefer them to my home-made purees although I don't want to use them all the time - especially since my freezer's stuffed full with multi-coloured ice cube portions!
His eczema is under control now with moisturisers and occasional steroid cream for flare-ups, I don't think he has an intolerance, and although we have eczema in the family we don't have any family history of food intolerances - I just like to go cautiously! So I was thinking of starting yoghurt in about 3-4 weeks and cheese maybe a few weeks later, does that sound reasonable?