Many City firms say they do a lot of advocacy work. In reality, few do. It is difficult, if not impossible, to justify the high cost yet relative inexperience of a solicitor-advocate. As a client, which would you choose? A junior barrister with, say, 5 years day-to-day experience before the Court at 200 quid an hour, or a solicitor advocate with a sprinkling of disputed hearings at twice the rate?
Likewise, it is extremely rare to qualify as a solicitor and then move to the bar.