According to Amazon, Vol. 2 comes out next summer and will have #24-38, along with Annual 1 and more UK Weekly issues, so I’ll probably get that if I don’t get impatient and start hunting down the original issues.
(Just FYI, if you get really impatient, and tracking down individual issues proves too hard, I imagine you could find a second-hand copy of this omnibus from 2002 pretty cheaply.)