Thanks for the suggestions. Unfortunately availability in the U.K. appear to be non existent for those products. The Markbass valve preamp is available here, maybe I'll check that out. No love for the HSStomp?
Sushi Box stuff is real good. The HX Stomp is pretty awesome too. I've been using the Bassman and Fullerton amp models and they have become my favorites. If you're not opposed to a multi-fx pedal, the Stomp can get into the Alembic zone and then some.