5  Difficult day at the end of a week's struggle  (7)

 9  Established audio newspaper in Germany  (5)

10 A new way to claim Reykjavik’s capital of polar region?  (9)

11 Yank to block Welshman providing on-line storage facility  (7,3)

12 Watch TV (first instalment only), then stop  (4)

14 Flush with excitement, initiating Hello Lovely chat up line  (4,3,5)

18 Unusually quaint limits managed, in grand scheme to reduce infection  (12)

21 My word is right  (1,3)

22 Empty H2O, a treatment with nothing in it  (10)

25 Fiddle with finger  (9)

26 Say angrily, "get knotted!"  (5)

27 Army officer in affair, a lot of bother after nest exposed  (7)

28 Earl stays out injecting Charlie (slang for drug)  (7)

 1  Caller’s instant irritability  (6)

 2  Pinch Pollux or Castor? (Pair from Gemini)  (6)

 3  Old art-form, painting without boundaries  (10)

 4  Universal tears but gracious  (5)

 5  A woolly hat ranks as a kind of fur  (9)

 6  Mini car right between two Fords  (4)

 7  Location of Brief Encounter?  (2,3,3)

 8  Act ended as another production abandoned  (8)

13 Shot multiple times, criminal happens to be wearing odd socks  (10)

15 Tortillas prepared in coastal regions  (9)

16 Set up and delivered witty riposte via Twitter perhaps?  (8)

17 Art form in lower region?  (8)

19 American loose women switching beds  (6)

20 Young man wanting love and fun, a bit of action on the side  (2-4)

23 Stewart divides last slices of the apple crumble  (5)

24 Pound off; I bought over 40%  (4)