RPM are running a pair of Vipers but I haven't heard anything about Gallardos yet.
From the paddock.net
Team Modena Enters Lamborghini Gallardos in GT3
British GT Championship
Sunday, 11 March 2007
Team Modena will be running two Lamborghini Gallardos in the GT3 class of the Avon Tyres British GT Championship in 2007. The cars will be run from the Lamborghini Wycombe workshops overseen by Team Principal Graham Schultz, with one car competing from the start of the season and the second joining in after the early rounds.