I've raised £830 to help fund Krzaczek's diagnosis and vet bills

Hi all,
My name is Kat, and I am a cat Mum of 11 years old kitty named Krzaczek (eng. Little Bush). Let me start with his story.
I found Krzaczek under a little bush (hence his name) when he was a tiny kitten, no older than one month. To you he may appear as an ordinary black cat, but for me, he is absolutely the sweetest Boy in the world and an apple of my eye. He has lovely, friendly personality and he is very smart (even does some tricks!).
Unfortunately, as it often is with male cats, his health is not great. He suffered from struvite crystals in urine, which led to perineal urethrostomy that was performed in 2020 in fantastic clinic in Poland, where we used to live.
In 2021 I took a position in London, UK. From the beginning, even though an import of an animal to the UK is difficult and expensive, and even though I was warned that landlords don't appreciate pets in rental flats, I knew my best furry friend will come with me. Everything worked out for us, and since April 2021, Krzaczek is an English gentleman living his best spoiled UK dream.
Unfortunately, due his prior health history, we are not eligible for any pet insurance. This leads us to this day...
Last Monday, Krzaczek was rushed to the vet, due to urinary issues. He was given anti inflammatory medication and some painkillers, but with no improvement, and blood and protein present in urine, he requires expensive diagnostics (ultrasound, x-ray, blood testing, hospital stay) and potentially very expensive treatment, which unfortunately I can't afford without help from the outside.
That is why, even though I feel loads of embarassment, I would like to kindly ask for your help. Every pound would make a huge difference for me, Ben - Krzaczek's cat Dad, and Krzaczek.
If you would like to get to know Krzaczek better, or see him perform some tricks, visit his Instagram @krzaczek.the.cat.
Thank you.