Not so much lawyer jokes, as judge jokes, which in Britain means "senile lawyer". (Well, senile barrister, which is the type of lawyer that wears wigs and gowns).

A judge comes into court to announce a verdict in a civil case. After all the bowing and scraping, everyone sits, but then the judge says, "I have reached my decision in this case, but unfortunately I have left it in my chambers. I regret that we will have to adjourn until it can be posted or brought by messenger". One of the counsel stands up. "Fax it up, m'lud ?", he suggests. "Yes, it rather does", replies his lordship.

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Another one, popularly attributed to a famous barrister, E. E. Smith (later Lord Birkenhead).

Judge I have listened to your address for several hours now, and am no wiser.

Barrister Perhaps not, m'lud, but you are much better informed.