"topology-id": "flow:1" present sporadically

When running regression tests the flow:1 topology is sometimes present and sometimes it is not. This shows that the timetaken for ODL to detect the extra flow is not constant

Steps
Startup ODL
Wait
Call http://localhost:8080/restconf/operational/network-topology:network-topology/

ODL details:
org.opendaylight.controller.version = 0.1 org.opendaylight.controller.build.scm.version = a31a4448ea6665317f4af41ae26d804829418c04
org.opendaylight.controller.build.user = jenkins-controller org.opendaylight.controller.build.workspace = ********** org.opendaylight.controller.build.timestamp = 1400624933140 org.opendaylight.controller.build.machine = **********

Result
This topology may be present or it may not.