Has your guppy population gotten out of control? I have several tanks to accomodate males, females and babies separately. I would be happy to take some, especially females. I would suggest that you can keep your males because they are more colorful and they won't lead to an overwhelmingly large population, as long as you remove the females.
I would be happy to take your guppies off your hands. I have recently rehomed some healthy guppies (only males or only females), but I also have permanent residents who are the products of inbreeding and have found their forever homes with me.
The only catch is that I don't have a car, so you would have to drop the fish off yourself, but that way you can also see that they go into clean, spacious tanks.
Please note that we live in Hull.
Thanks for reading! :)