Umm who here can say definitively the guy is stealing service?
Didn't think so. If he's paying for it and worked around the 1 address 1 modem restriction he has every right to have 5 modems, and jealousy / indignation / whatever calling someone a thief without proof is a bad idea.
He may have acquired the SB during Telewest days and gotten the Ambits from VM.
I don't see a set top box anywhere in that lot, I see a Draytek, a Surfboard, coax splitters.
EDIT: Or he could have taken the photo from a cable hacker forum or someone with far more money than sense and be winding you all up