GNER and Wifi

GNER Wifi service is designed to provide a Wifi service on trains. On Monday I was travelling back from a meeting on the 16:05 from Leeds to London Kings Cross (in the quiet coach) and I opened up my iBook, straight away it detected the network and I associated with it. However no matter what I did it refused to give me a DHCP lease. So all I can report is don't rely on Wifi being available as it may be broken.