Hi
I think you can donate spare frozen embryos to another couple if you want to, I would talk to your clinic,
I was very much under the impression that the choices were donate to another couple, donate to research or let them perish,
Fertility friends is not a site where you can arrange donating eggs/sperm/embryos/surrogacy etc, but I think many couples have donated embryos to others through their clinic and I've definitely seen it referred to,
One issue is that you would have to happy for any children born from this to contact you if they wanted at 18- I think that has limited it in this country, also the fact that your children could have full siblings-somewhere,
I think if it feels right for you it is an amazing gift to give,
Livity