2680: Two of a kind

Two works, 1A/8 (four words in total) and 27/36, are by authors born in 25 and 17 respectively. Two other unclued lights give their forenames: a further relevant name will appear in the completed grid and must be shaded. Ignore an apostrophe.

Across

7               Maybe bowler’s come again wanting wickets (3)

11            Turn out active ox not acceptable within summerhouse (6)

13            Soft landlord produces hammer (7)

15            Refuse to kill nearly everybody (5)

16            Insect notes garnered sesame (5)

18            About 586 yards past American state (5)

20            Brazen co-regent’s demand for more (6)

21            Pushers of quality drinking in room with no end of champagne (5)

22            Lord Dandy in blackish-green (7)

29            Circuits in Bahrain and Silverstone (5)

30            Note blade in Hiawatha’s place? (6)

32            Severe rebuff for busybody (5)

37            Spooner’s very cunning (5)

38            Parrot takes time flying round palm tree (7)

39            A small police station in Asian city (6)

40            Pigeon delivering letter for sister (3)

41            Bloomers poorly grown by northern beings (11)

Down

1               A skill of Fred could be apt for puzzlers (10)

2               Unceasingly worm is hiding in eastern seaweed (8)

3               Auditors set to work in large ships (9)

4               Where poet overheard storekeeper (12)

5               Small vessel in west half of very small bay (7)

6               Book easy to promote (8)

7               Country dance keeps feet vigorous (5)

9               Jacobean linguist desperate for oil (6)

10            Man perhaps carrying tons shows fibre (5)

12            Nose of bright yellow wine (6)

14            Modest punter cheating death (12)

19            Send moth up about singular scruffy state (10)

21            Pass time in English and Irish town (9)

23            Plant in plots with upward growth (8)

24            Man, visiting Virginia among writers, goes camping (8)

26            Quiet piscivore coming up quicker passage...