Across
1 Physicist showing new path he’s worked out with chess piece (7,7)
9 So marsh, except for odd parts, happens to be fertile spot (5)
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10 Carnivore in rage, very unhappy, coming back with new energy (9)
11 Increasing taxation initially relating to jewellery (8)
12 Most unusual depth in poem by saint (6)
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14 End of annual period around Christmas (4)
15 Dignified arrangement of a quest set up without pressure (10)
18 Fruit began to go rotten in vehicle (10)
19 Search with horse covering miles (4)
21 Meal, excellent, quietly consumed (6)
23 On the whole exhausted before melodrama’s last lines (3,2,3)
25 Passed area in open range (9)
26 Material from speech in order (5)
27 Crime writer’s odd gems one ignores (7,7)
Down
1 Print lingo boss translated for football team (8,6)
2 Point for example about registration mark’s hidden feature (6,3)
3 Trouble with fluttering lashes (6)
4 Occasionally negative, therefore receiving stick (3,3,4)
5 Clever chart from which temperature is taken (4)
6 Very involved requirement in store (4-4)
7 Sound from hooter, overwhelming one (5)
8 Get through election mostly working for high-flying data collector (7,7)
13 Plots beginning to subvert Conservative policies (10)
16 Extract estimate of cost (9)
17 Doctor cares not for predecessor (8)
20 Funny series? Some miss it completely (6)
22 Bit quiet, vocally (5)
24 King unknown in middle of desert island (4)