There is already caselaw on this and the exchange rate loss is not a reasonably foreseeable consequence of any delay assuming that you were responsible for the delay!
At this stage, I have to ask a question and that is, is your brother financially quite well off and the reason I ask that is because it could well be the point that he has done this on purpose to get at you if there has been a falling out. He will know using the tracking system whether it shows that he received it and just because there is no signature doesn’t necessarily mean that it hasn’t been received by him. Unlikely but possible.
If you refused your request for him to give you his bank details, and he has relied on snail mail, but in my opinion, he has been the author of his own financial misfortune.
There is obviously no problem giving him a pounds Sterling cheque for the amount of money but with regard to the exchange rate, I do not believe that you have any liability for the reasons I mentioned.
As this has caused the stalemate, you can tell the other beneficiaries exactly why you are now not able to finalise the estate although to be honest, I think you can finalise it because any claim which he has in respect of the sustained rate loss would come down to you personally not the estate. Having said that, I still don’t believe that there is any liability here.
I am writing this as I read your writings and I see that in your second response, you now make the point that for whatever reason your brother did receive it but decided not to present it. It’s interesting that we both come up with the same point, quite independently.
There is no consequential loss claim against the carrier although I don’t think there’s a consequential loss claim here at all.
Can I clarify anything else for you?
I’m happy to answer any specific points arising from this.
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If you still need any point clarifying, I will still reply because the thread does not close.