20.—(1) Where, the proceedings for, or in connection with, nomination are on any day interrupted or obstructed by riot or open violence—
(a)the proceedings shall be abandoned for that day; and
(b)if that day is the last day for the delivery of—
(i)constituency nomination papers, in the case of a constituency election; or
(ii)individual nomination papers and party nomination papers, in the case of a regional election,
the proceedings shall be continued on the next day as if that were the last day of such delivery, and that day shall be treated for the purposes of these rules as being the last day for such delivery (subject to any further application of this paragraph in the event of interruption or obstruction on that day).
(2) Where proceedings are abandoned by virtue of this rule nothing—
(a)may be done after they are continued if the time for doing it had passed at the time of the abandonment; or
(b)done before the abandonment shall be invalidated by reason of the abandonment.