Britons to watch out for at the Aviva Grand Prix in Birmingham this weekend The former world youth champion false-started at last week's UK Indoor Trials but she has run quicker than teenager Jodie Williams this season and a decent performance could seal her selection for next month's World Indoor Championships in Istanbul. Joe Thomas: Men's 800m, 2.31pm The Cardiff athlete has been one of the revelations of the winter and it will be fascinating to see how he fares against the likes of Poland's European champion, Marcin Lewandowski, and Ethiopian Mohamed Aman. Jessica Ennis: Women's 60m hurdles, 1.51pm; long jump 2.56pm The reigning world indoor pentathlon champion has begun the year in scintillating fashion, twice equalling her hurdles personal best and producing her best ever season-opening high jump. She will hope to maintain that momentum before she defends her world crown next month.