Of course I've read the half yearly, but I'm somewhat sceptical...

Of course I've read the half yearly, but I'm somewhat sceptical as to why the interim dividend jumped so much compared to the historical growth rate.
Ordinarily, that would indicate the Board's very strong confidence in the company's ability to sustain the payout and to grow profits. There should be little reason for insiders, therefore, to sell.
Put another way, if dividends (or dividend payout ratios) weren't to be maintained, say, from H1 22 onwards, then there would exist reasonable grounds to suspect some degree of manipulation of the market's expectations, in the name of self interest.