Separate names with a comma.
I should've checked again this morning - having my laptop off all weekend seems to have renewed the lease anyway, and the VMs are working...
lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> mtu 16384 inet6 fe80::1%lo0 prefixlen 64 scopeid 0x1 inet 127.0.0.1 netmask 0xff000000...
Almost. Switching to Bridged Ethernet re-instated the network connection, but when I switched back to Shared Networking it was lost again.
None of my guest OSs are able to connect to the network. I have Network Adapter Options set to Device Status: Enabled, Comment cable at startup...