Some solicitors say they refuse to accept undertakings or irrevocable authorities.
You might think this is sensible. There needn't be such reluctance as long as you use a bit of foresight in covering all possible consequences and think carefully about the likely interpretation of your representations or perhaps your silence. Following the Family Court judgment the client instructed O to lodge an appeal. O informed L of the amount then due for his costs and subsequently of variations in his claims for costs. A short time later the client withdrew instructions from O and wrote to L revoking the authority.