3i Infrastructure paid out its Jan 2020 dividend on Monday 13th Jan 2020.
4.6p a share.
https://www.londonstockexchange.com/exchange/news/market-news/market-news-detail/3IN/14288784.html
3i Infrastructure plc has 891,434,010 issued ordinary shares with voting rights admitted to trading on a regulated and prescribed market.
Thus:-
891,434,010 x £0.046 = £41,005,964.46
That is £41m
A yield of 4.37%