Legal Week has a news report on the law firms that advised on the transaction. They are Hogan & Hartson (for Ford), Herbert Smith (for Tatas) and Allen & Overy (for the consortium of banks). The report, however, does not mention about the involvement of any law firms on the Indian side.
(In case you are unable to access the hyperlink above, please try copying the following and pasting on your browser: http://www.legalweek.com/Articles/1109477/Hogan+and+Herbies+handle+Ford’s+1bn+Jaguar+sale.html)
“Legal Week” link is not working
Thanks for pointing this out. There seems to be some complication with the hyperlink. I have provided the URL on the post, and hope that helps.