We generally peer openly but prefer route-server sessions to direct sessions unless there is a compelling reason to do so. We already announce all routes to the route-servers on IXPs we're present.

Private peering in Scolocate and LD4 invited. Private peering welcome in other sites but we have IXP connectivity there. 

IXManchester encouraged for northern peers.

No longer peering on Edge-IX and LINX Extreme.