studio in london. ben brown, thank you. the time is 1:19pm. our top story this lunchtime. ukrainian officials say they fear around 300 people may have died in a russian bomb attack on a theatre in the besieged city of mariupol. still to come, we speak to the cast of the small budget film which may now win big at this weekend's 0scars. coming up on the bbc news channel: the football association will provide 100 free buses for fans attending the fa cup semi—final between liverpool and manchester city at wembley, after complaints that there were no trains available. a volunteer army of 16,000 people has helped recover data about uk rainfall going back nearly 200 years. the volunteers have digitised millions of handwritten rain gauge totals — giving the met office a much clearer picture of our weather, and allowing experts a better understanding of climate change. 0ur climate editor justin rowlatt has more.