What is a suitable expression of 'Thank you' for legal support representing me in negotiating the MTA?

[RoboNova]

Hello,

I have recently concluded a negotiation of Mutual Termination Agreement with my employer, where I have extensively benefited from great legal support service of the lawyer I opted for. I am very grateful for all their support and effort, as well as pleased with the outcome of the negotiations.

Is it customary to express my gratitude in a more straightforward way? Would sending flowers or maybe something like a gift basket be preceived as too much, overstepping the professional relationship?

Additional context to this case - I have a legal insurance, which will cover the fees expenses, maybe that's why I also feel psychologically bit in debt towards the lawyers.

Thanks in advance for any comments and insights on this.

[Feierabend]

I can't see any problem with a nice non-financial gift that everyone in the office can share - lots of unacknowleged donkey work is done by the secretaries or whoever. Big flower arrangement + posh cake could hardly offend!