Jack Barr used to go out occasionally when he came back to the UK on vacation - I worked with him once - he was a nice guy. I guess the GB are like most elders - some might do a bit of ministry , most do as little as they can get away with. They are exempt from any counsel as nobody is going to brave enough to pull them up on their lack of ministry.
A brother in my congregation had a nice holiday home that he gave free lodging to for Bethelites. We had a lot of heavies who came for a week or two at a time , including most of the UK branch committee. Very , very rarely did any of these guys go out on the ministry , even for a token hour after a Sunday meeting. My wife often asked their wives to go on a study with her but almost always they would refuse. I was public talk co-ordinator and I struggled even getting them to give a talk - it was as if they couldn't be bothered as they were on holiday.
Judge Rutherford reputedly never went out on the ministry , citing "security" reasons. Knorr didn't seem to keen either. Ray Franz wrote that some of the GB did either very little field service or none - specifically naming Milton Henschel. This seems to be confirmed when Henschel went on a "zone visit" to Malta , insisted on staying in 5 star hotels with his wife such as the Hilton & spent his time doing sightseeing or sunbathing rather than going on the ministry with the local brothers. This stumbled a British MTS graduate so much that he "left the truth".
http://www.freeminds.org/history/bonanno.htm
