Chijindu Ujah, European Junior Champion 2013, went sub 10 at the weekend, 3rd fastest brit ever.
Adam Gemilli ran 10.07 in Rome last week, just 0.01 outside his PB in his first major meet of the season. If he stays injury free, should definitely go sub 10 and sub 20.
A-Aryeetey, Ellington, Talbot, Safo-Antwi, Tobias have all opened the season with PB's. One of them may go sub 10, but they should all come close, 10:0X.
If Richard Kilty can replicate his indoor perfomances, another sub 10 is on the cards.
James Dasaolu can overtake Linford Christie (9:87) if he gets over his injury problems that troubled him at the tailend of the outdoor season and indoors.
Depth and potential, British sprinting is healthier now than it has been for a long time.