ACROSS
1 Derek - - -, Last Tango in Halifax actor (6)
4 Former Blue Peter presenter, - - - Turner (6)
9 Baby podge? (5, 3)
14 Go wrong (3)
15 Written agreement (8)
16 Characteristic (of) (7)
17 Celebrity wine connoisseur (2, 6)
18 Lughole? (3)
19 Fork-tailed bird (7)
20 Stock-cube brand (3)
21 Renaissance artist (12)
23 Comedian, - - - Vine (3)
24 Hierarchical tiers (5)
26 Hidalgo and Doctor Zhivago actor (4, 6)
28 Utilise (3)
29 Group of nine (5)
31 Feeling of having done something before (4, 2)
33 University Challenge host, - - - Rajan (4)
34 - - - Noir, grape (5)
35 Medical body (1, 1, 1)
36 Rome’s country (5)
38 Gladiator, pictured top (6)
40 Rambler’s trek? (4)
43 US rocker,…