selection for uk world indoor trials

does anyone know how you get selected to run at the world indoor trials? i.e top 50 ranked athletes in each event or run an entry standard time?

There is a entry standard that you have to have done between 1st Jan 2009 to 7th Feb 2010

All the info is on the UKA website.

Though it is: (indoor times)

60m - 6.90s
200m - 22.1s
400m - 49.0s