Coffee Break Teaser 2 by Trinculo

Across
7 Might they contain explosive revelations? (9)
8 Beef tea in flask Alf left (5)
10 Stay to the end (where Kent is dismissed following on after initially edging it) (3,2,3)
11 Forward with revolutionary key change (6)
12 Note Captain changes name to Mike (4)
13 Ugly sister keeps cool (8)
15 It's bizarre to trail chamber musician (7)
17 Cushion blow first, fools! (7)
20 Petrol: the French add two thirds on the house (4-4)
22 Mother gets on a horse (4)
25 The relative argument? (6)
26 Convinced about nice arrangement being money for old rope (8)
27 Reportedly remained calm (5)
28 End soccer build up on a high (9)

Down
1 Knees-up with Northern bird (5)
2 Old Nick's lost article on rage and ridicule (6)
3 Sadly, our Tom is retiring (8)
4 Surgeon involved in accident is treated (7)
5 Tries small locks (8)
6 Retire and judge the government from here? (9)
9 In charge over Beckham, say (4)
14 Lens TV's sound and picture (9)
16 Ad Phylis used to become titled (8)
18 Warn Diane about Monday and the evidence of smoking outside (8)
19 Book admits Gaelic King was insane (7)
21 Others over the way (4)
23 Sit in it when the oldest in town? (6)
24 Ed comes up with art deal (5)