The Borrible Trilogy was republished on 21st June 2002
by MacMillan's of London

All three adventures:

The Great Rumble Hunt
The Borribles Go For Broke (in the Wendle Labyrinth)
Across the Dark Metropolis

all in one bumper volume

Now also available in mass market paperback format at £7.99 from TOR as of 4th April 2003.