6  Key symptom of scabies is something very unpleasant (5)

 9  Can ordinary diesel be produced from this? Yes and no (7)

10 One’s mother possibly describing a park in Richmond in speech (3,4)

11 Mineral that is found in Regents Park…. (4)

12 ….and another that is found in Hyde Park (10)

14 The Corrs - a smashing group of musicians (9)

17 An attempt to cause embarrassment (5)

18 Compel king to enter place of ill repute (5)

19 How can you be out of beer unexpectedly after a single game? (3,6)

21 Steals more unusual rubber-like substances (10)

22 Bishop leaves bicycle in front of a furniture store (4)

25 Possibly warning other road users in part of London (7)

26 Ground worried trainer (7)

27 Enzyme setting you back less than a tenner? (5)

28 One sibling lay back and allowed intercourse to start (9)

 1  It could be me being irritated by dispute about new leader in Downing Street (9,6)

 2  Just over half of sitcom can be seen in Scottish town (5)

 3  Flat-bottomed vessel from a German port reportedly (4)

 4  What Mr Ernst has is something left over (7)

 5  Whose pan is less hot when cooking mangetout? (4,3)

 6  A spa so good they named it twice? (5-5)

 7  See the chart-topping singer perform in comic opera (3,6)

 8  Attractive object that brings good luck? (9,6)

13 A president set out to be dull (10)

15 Is this ethnic area part of the Potteries? (9)

16 Regret being heartlessly cruel? On the contrary (3)

19 Tells stories about cat in French city (7)

20 Travel about large state to procure fabric used in sportswear (4-3)

23 Set up joke about a village in Africa (5)

24 Language used by Monsieur Dupont (4)