Special, Sunday 03 Jan 2016, IXL 2015 Onstage Final CW No1, xChequer

Three answers per commenter as usual (annotations compulsory) till 6 PM
As far as possible please give all your answers in one comment.

ACROSS
8  Nervous boys lisp perhaps (8)
9  Extremely responsible when working with purpose (6)
10 Setter to remain absorbed in endlessly silent setting (6)
11 Carefully select hour and implement (4-4)
12 Return fake diamond ring (4)
13 Present day is fun (7)
15 Couple shared without limit (4)
17 African sprinter, say, died after dash (5)
18 Hearing recorded in mechanical fashion (4)
20 Bat, vacating crease without question in turning pitch (7)
22 People accepting one’s behaviour (4)
24 Power corrupted a couple of people (8)
26 Alight coming to area at front of business lounge (6)
27 Rate finally picking up momentum to provide value (6)
28 Sure, a line at the end! (8)

DOWN
1   Oil – topic in dispute for keen party member (8)
2   Saw pieces off leaving cold wood ultimately (6)
3   Constrained after a flourish (6)
4   Fancy army that protects (4)
5   Unbreakable carbon lined metal shaver (8)
6   One with duty obligations working extra to obtain income (8)
7   Against shifting time in concern to testify (5)
14  Chaos from rebelling United supporters (5)
16  Brought up in turn to change uniform, briefly embarrassed (8)
17  Ejaculates yielding to demand during wild sex (8)
19  Nothing short of love bonds otherwise sweet nippers (8)
21  Unlikely acute pressure is seen with a storm in this (6)
22  Money one spent beyond allowance brought about strain (6)
23  Force is to crudely thrust (5)
25  Small babies occasionally raised flags (4)

Across Lite version can be accessed at IXL-2015 Onstage Final 1

Enjoy.