Good - well let's hope we can get to the bottom of this one, as neither you nor I are specialists, yet I'd imagine both Roddy Dunlop and the firm of Livingstone Brown are, and for reasons I don't understand they don't seem to agree with each other.
Roddy Dunlop's tweet wasn't speculation - he said contempt of court protections are triggered on arrest and he seems to have backed that up with an image of the relevant legislation, which seems pretty clear that arrest is a trigger for when contempt of court applies. The legislation he posted was the Contempt of Court Act 1981, Section 2 which says:
2 Limitation of scope of strict liability.
(4) Schedule 1 applies for determining the times at which proceedings are to be treated as active within the meaning of this section. If we look at Schedule 1:
SCHEDULE 1 U.K.Times when Proceedings are Active for Purposes of Section 2
3 U.K. Subject to the following provisions of this Schedule, criminal proceedings are active from the relevant initial step
specified in paragraph 4 [F32or 4A] until concluded as described in paragraph 5.
4 U.K. The initial steps of criminal proceedings are:—
(a)arrest without warrant;
(b)the issue, or in Scotland the grant, of a warrant for arrest;
5 U.K. Criminal proceedings are concluded—
(a)by acquittal or, as the case may be, by sentence;
(b)by any other verdict, finding, order or decision which puts an end to the proceedings;
(c)by discontinuance or by operation of law;
7 U.K. Proceedings are discontinued within the meaning of paragraph 5(c)—
(b)in Scotland, if the proceedings are expressly abandoned by the prosecutor or are deserted simpliciter;[/i]