Found it-- thanks for the advice
Hi— I would like to buy a good low F whistle.
Please let me know if you have anything for sale and how much you’d be asking for it.
At the moment I am living in the US- in New Hampshire.
Thanks very much.
https://forums.chiffandfipple.com/t/wtt-alba-low-f-for-a-low-g-whistle-sold/103820/1
She wants to trade for a low G but thats a really specific trade, she will probobly sell if you ask.