1 Petrol (8)
5 Dross (6)
9 An engraved inscription (8)
10 In England, it's a spanner (6)
12 Autograph (9)
13 A sweetener (5)
14 Small island (4)
16 An unspecified future time (7)
19 From end to end (7)
21 Where birds live (4)
24 An exact duplicate (5)
25 Disequilibrium (9)
27 Naughts (6)
28 Confuse (8)
29 Not airtight (6)
30 Aubergine (8)
Down
1 A metamorphic rock (6)
2 Selfish (6)
3 Insect stage (5)
4 8th planet of the solar system (7)
6 Xmas (9)
7 Rebel (8)
8 Receptacles for cigarette ash (8)
11 Animal companions (4)
15 SW (9)
17 Specified individually (8)
18 Standards (8)
20 Inheritor (4)
21 Apprehending (7)
22 City in Turkey (6)
23 A group of six (6)
26 Ease (5)