Thanks for the 'advice', Pianorak.
I am being a) patient (you'll notice that I haven't hassled Avbrief directly. For the very reason that it's a free service and I don't really have a right to). b) I've tried upgrading to subscriber status but it won't let me.
I've just been intrigued if anybody else has been having similar experiences and then answering the subsequent questions.
But thanks again for your valuable input. And here's a smiley of my own: