That sounds smashing, Paddy. Getting self set seeds is a bonus, isn't it? I have corncockle seeding all over the garden from last summer.
Last year I had a lot of space to fill in the garden and I wanted quick, cheap, colour that would be beneficial to insects too so I ended up chucking various wildflower seed mixes on to any bare patch of earth I had. By doing this I cut out all the hassle of transplanting and thinning out, although the results were a bit hit and miss. In some places, due to the very dry April, nothing germinated.
You can see some of the flowers that resulted on the attached pic.