Operation Save Citrus

Citrus is sick. He has advanced tail rot, which initially looked to us like grubbiness. We didn’t spot he was poorly until he went off of his food.
We have been informed his tail needs to be amputated, With bloods, pain meds, the x-ray, anti-biotics and the surgery, it comes out at middling £760ish, which, with gofundmefees takes, me. up to about £800 (amount will be edited to take into account any outside donations from paypal etc). 
I can’t afford that. I am not expecting to raise all the money, but I need a little help, I don’t want him to be put down. he’s a wonderful pet and he means the world to me.