I just remembered, GBLX was bought by L3 a few years back - I'm guessing someone has a "tighten up route maps for GBLX ASN" ticket open in their backlog at the Level 3 NOC.

The people managing peering for AS 3356 and AS 3549 should be the same group, no? ("That DB we don't share the URL of" seems to imply as much.)