For two grand old Banyan trees that have been on Sarjapur Road in Bangalore, for around 300-400 years, their guardian angel is surely perched up there in one of those outstretched branches. The friendly wood nymph has not only prevented workmen from raising the axe at the nick of time, but has steadily brought about a change of heart in one official after another in the many departments that determine the fate of the trees. First, general secretary of the Koramangala Residents Civic Group Ramamurthy, who