Please refer to the Official ABB site for the most recent information.
The Spring Championship Bloodhound Trials were held 17th to 20 March 2014, on the East Yorkshire Wolds.  
The previous ABB Championship Bloodhound Trials were held in the first week of October 2013, at Morebattle, in the Scottish Borders:
Further details are available from the official site.
The first ABB trials event in 2013, started on 18th March; the Championship Trials at Irby upon Humber, Lincolnshire.
 
For the ABB Autumn 2013 trials try here.
For the ABB Spring 2013 trials try here.
For the ABB Autumn 2012 trials try here.
For the ABB Spring 2012 trials try here.