(1) If, during the period of any forecast made by the issuer:—
(a) an event occurs which, had it been known when the profit forecast was made, would have caused any of the assumptions upon which the forecast is based to have been materially different; or
(b) profit or loss is generated by some activity outside the issuer's ordinary and usual course of business (which was not disclosed as anticipated in the document containing the profit forecast) and which materially contributes to or reduces, or is likely to materially contribute to or reduce, the profits for such period,
the issuer must promptly announce the event and relevant details. In the announcement, the issuer must also indicate the likely impact of that event or activity on the profit forecast already made.
(2) The issuer must announce the information under rule 17.26B(1) as soon as it becomes aware that it is likely that the contribution to or reduction in the profits made or to be made by the profit or loss generated or to be generated as aforesaid will be material.