OK, I seem to have got wireless working.

First I disable NetworkManager.

Then I manually run wpa_supplicant
ThinkPad-E420:~$ sudo wpa_supplicant -c wpa.conf  -ieth1
ioctl[SIOCGIWSCAN]: Invalid argument
Trying to associate with 00:12:bf:25:b8:3a (SSID='Marsprobe' freq=2462 MHz)
ioctl[SIOCSIWAP]: Device or resource busy
Association request to the driver failed
Associated with 00:12:bf:25:b8:3a
WPA: Key negotiation completed with 00:12:bf:25:b8:3a [PTK=TKIP GTK=TKIP]
CTRL-EVENT-CONNECTED - Connection to 00:12:bf:25:b8:3a completed (auth) [id=0 
id_str=]

I then find that I have an IP address:
$ ifconfig 
...
eth1      Link encap:Ethernet  HWaddr ac:81:12:3a:02:db  
          inet addr:10.1.1.12  Bcast:10.1.1.255  Mask:255.255.255.0
          inet6 addr: fe80::ae81:12ff:fe3a:2db/64 Scope:Link    
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:142 errors:0 dropped:0 overruns:0 frame:59
          TX packets:171 errors:246 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:45777 (45.7 KB)  TX bytes:32190 (32.1 KB)
          Interrupt:19 
...

Finally I manually edit /etc/resolv.conf to manually set my nameserver

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https://bugs.launchpad.net/bugs/793401

Title:
  Network Manager says Wireless is disabled, using Broadcom 0576 (rev
  01) .

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