Mandala: how frustrating! I'm afraid I go along with Mr Wilde who said "I can resist everything except temptation," and I exhumed my copy and have slapped in all but one. That one, of course, will plague me until closing date (Dec 17) or until newsagents around the country release their copies, whereupon helpful hints will be appear in this very column...
Some nice clues, and I was pleased to see that I taught for a while near 20a!