If anyone's interested in the procedure of cases like this, look here: https://www.catribunal.org.uk/sites/default/files/2017-11/The_Competition_Appeal_Tribunal_Rules_2015.pdf
You'll probably want to look at the sections on the 'fast-track procedure' as well as 'disclosure'.
TL;DR, under the fast-track procedure, the main substantive hearing is supposed to be within 6 months of the court deciding to put the case on the fast-track procedure.
Disclosure happens early on and will include all documentation relevant to the substantive issues in the case. The play here, I guess, is to