8  High point: Heinz soup with temperature injected (6)

 9  ... unique correspondence in the Queen's autobiography? (3-2-3)

10 Once again send on through Cambridge University (10)

11 Radiograph crossbeam (1-3)

12 Drunk, having drunk fizzy beer after devouring eastern dessert (6)

14 When camping, old Resident Magistrate originally started troubles (8)

15 Native American child and father sit around circle (7)

17 Traced German army pressman (7)

20 Steps taken before an engagement? (3,5)

22 Model, having taken the old solver back, moves along slowly (6)

24 Resign entirely? Not entirely! (4)

25 Destination once tides in sea away? (4,6)

27 Womens' advocate Tracey is wrapped in pink paper (8)

28 Fixed English notice in pen (6)

 2  Latin individual - a right fibber (4)

 3  Political entities king abhors harbouring a knight (8)

 4  Businessman, quiet on the way to work (7)

 5  Fool's derisive remark about saint (6)

 6  On high, I disturbed silence outside Times Square (2,8)

 7  Take cloak off Ban Ki-moon, say, and let loose (8)

13 Disreputable tabloids on evidence of crime, perhaps (10)

16 Sailor causes uproar counting frames (8)

18 Most overly-theatrical mimes performed in headgear (8)

19 Perhaps Big Dave's Crossword Blog shows up in puzzle - 'tis bewildering! (7)

21 Intellectual recalling quote regarding... (6)

23 Party's ending? That is, Liberal Democrat section gives up (6)

26 Went over in the outfield at Lords? (4)