Twas certainly launched from low level from the Buccaneer, however we did transit at high level with them (or their training equivalent ARAMs) but certainly not the distance that it might have covered getting 'darn sarf'! That said, I flew successfully from Honington against a Soviet fleet in the Iceland/Faeroe's Gap with ARAM - but it wasn't 8 hours plus at 35K feet, more like 2, and included AAR!!
Foldie