Cherie Booth QC and her barrister colleague at 4-5 Gray's Inn Square, Jane Oldham, were guest speakers at a seminar, Breaking Through the Glass Ceiling, at the inaugural meeting of City firm Berwin Leighton's Women In Business Group. About 80 businesswomen attended the event at London's Tallow Chandlers Hall last week. The group, which is the initiative of Berwin Leighton senior assistant Joanne Gubbay, aims to encourage an exchange of views among women in executive and management positions.