UPDATE: - (Thursday 29AUG2013 - 22.20 BST) I have now successfully eliminated the 'malware' from this blog, at the cost of losing my customised template, a probably unnecessary 'over-kill' measure, but so be it. Most of the functionality of the blog remains, if differently organised. I will probably over the course of coming days/weeks reinstate a similar customised template. For information, the source of the 'malware' was a link here to a blog from Zimbabwe which had been inactive for some time, but which I had neglected to remove.
I am leaving the rest of this blog entry text in place, but italicised, for the record:
I have just substituted my pre-existing blog template for a standard blogger template as part of my efforts to expunge some 'malware' which has apparently affected my blog; I have just become aware of this infection today, but suspect it may have been in place for the past few days. If I am unable to trace and remove the 'malware' over the next few days, I may feel obliged to take the very hard decision to delete this blog completely, a hard decision because it has been in place for over 11 years - but if this is what I have to do, then so be it.
I am aware of the apparent source of the 'malware' infection, but will not say any more about that just now. Fortunately my other blog and my other websites are unaffected.
If you see a 'malware' warning when you visit this blog, please navigate away from it without delay. Thank you.