Solvers should highlight the 1D and 13A forms of the 6A 37A in the completed grid, thereby both filling in the otherwise-isolated squares and explaining the significance of the title.

Across

1 Piece of music about animal caught in railway carriage (6)

11    Angelic hordes holding divine flower? (5)

12    Anarchic unit in Ambridge exhausted BBC (6)

14    Moon rocket fooled maestri (7)

16    Stars forgetting lines in Bodleian? (5)

18    Ages of young cads regularly withheld (5)

20    International plant produces iron framework (4,3)

23    Auditor’s crossed river in Lycra (7)

25    Former PM eclipsed Macmillan or Thatcher (5)

31    Patagonian hares about among ruins (5)

32    Bad head? Sinusitis, perhaps (7)

33    We induce an immune response in old giantess that’s ailing (11)

34    At home, judge Eastern recipe asking primarily for Ethiopian bread (6)

35    Prove Marguerite’s content (5)

36    Attempts tests with much lower grade initially (6)

Down

2 Ghastly chore yields money! (5)

3 School secured ‘ten’ with someone at the helm (5)

4 One nettles René d’Herblay (6)

5 Commercial I inserted in standard broadcast (7)

7 Family men last to leave except when college opens (6)

8 Shell used to buy up independent business, investing money (5)

9 Foolish old king ending in brown study (5)

10    Awfully lean, needing way to put fat on (6)

15    Cover for Caesar to go absent from the front (4)

17    Keen on badminton to some extent (4)

19    A man with an ark picked up dwarf buffalo (4)

21    Concerning banishment from beating heart of Dixieland (7)

22    Cases of butter include cheese (4)

23    One breaking into grin, as happy as Larry? (6)

24    Snide about unknown film producer (6)

25    Ungulate wandering in Gaul (6)

26    Missing first love, statesman who keeps stocking (6)

27    Orchards originally unaltered and used in floral arrangements (5)

28    Lives with right leg in fetters (5)

29    Injured miner isn’t prickly (5)

30    Children, a bone of contention (5)

Download a printable version here.

A first prize of a £30 John Lewis voucher and two runners-up prizes of £20 vouchers for the first correct solutions opened on 18 May. Please scan or photograph entries and email them (including the crossword number in the subject field) to crosswords@spectator.co.uk, or post to: Crossword 2750, The Spectator, 22 Old Queen Street, London SW1H 9HP.