Nick,
many thanks for such a comprehensive reply.
I am now a little confused as which photo was taken in P mode and which was in Auto mode.
I thought the camera might tell me, but appears not too. So my memory is the only guide.
Yes, you are most likely correct about the exposure, tho' it was grey outside. I assumed the camera in programme mode would work it out for me, as well as in Auto mode.
As said I did tamper with one of the photos with CS2......
I must learn to read the histograms as I have never worked what they represent, and use them to produce better photos.
Anyway thanks for your time and thoughts, the flowers now have gone, but if summer perks up, I might a couple more....
Mj