Question Author
Thank you everyone who advised me about my avatar. I had followed all of the instructions but, frustratingly, it took several days to arrive. As you can see it has now appeared. I think the problem may have been that I was using it for 2 email addresses (including the one for AB) but the one for AB was not the primary one on Gravatar. I have now made it primary and here I am!!! No one else suggested this could be a problem but, in case this did solve it - rather than just waiting - it might be worth passing on.