BTs longest standing advisers Linklaters and Bird & Bird have been retained, as have Wragge & Co.
Ashursts is perhaps the biggest loser. It has been the telecoms operators key property adviser for years.
Both Dentons and Lawrence Graham have lost out after recent instructions, while Freshfields has advised on some of BTs most significant recent corporate deals, including the spin-off of mobile arm mm02.
Outside the UK, BT uses Paul Weiss Rifkind Wharton & Garrison and Shearman & Sterling in the US and Baker & McKenzie in Asia.