UK-listed companies publish price-sensitive news through the RNS — the Regulatory News Service — usually at 7am, before the market opens. A results announcement is the big one, full-year or half-year, with the statements and the dividend. In between, many companies put out a shorter trading update: a few paragraphs on how the current period is going.
You don't need all twelve pages. Read the first one: the headline numbers against last year, the dividend, and the outlook paragraph. Then look for guidance — what management expects for the year — and whether it has moved. The market cares more about "we now expect profit at the lower end of the range" than about last year's figures, which it has mostly priced in already. The news list on a holding refreshes weekly, so on results day go to the company's own site or the RNS itself.
Page one, in that order. The rest is for checking, not for finding the news.
Educational content only. It is not personal financial advice.