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1a. ??a???i?b?. Those bringing cases unaffected by argument.
1d, 2words. 6.3. ??i?o? P??. Post Office has started up, accepting new and unpleasant sort of letter.
3d. 3words, 3.6.4. ??t ?e?o?? ????. OBE distributed with merit --- often rather late.
11d. 2words. 6.7. S?c?a? ??i?b?r.Networking expert whose plan is to scale.
17a. 2words.6.9. ??m??? C?u???i?g. Corrupt characters from Munich and Nurnberg --- inwardly cold and calculating.

Not looked at my copy yet Ron but so far these look like Plaintiffs, Poison pen, Not before time, number crunching

Post Office = Po
has started = is open
accepting new = (contains 'N')
Unpleasant letter = Def

Those bringing cases (to court) = Def
unaffected = Plain
arguments = tiffs

17 - anag Nurnberg + Munich + c (cold)

3 - anag again of - OBE + merit often

rather late = Def

11 Maybe Social Climber?

To scale = to climb
networking on social network sites (internet)

Thankyou , les40. grateful.