Good Morning and welcome! I am Dr. Loretta, a licensed veterinarian and I am happy to answer your question.
I am not from the UK but I do knoow, Chrissie, that the RSPCA will do low cost spays for Lottie. This LINK will give you the information you need to find a vet near you that will help. If you make some calls and are persistent, Chrissie, you will have no trouble getting Lottie spayed at a reasonable cost.
Does that make sense to you?
Please let me know if you have ANY other questions. My goal is to give you 100% satisfaction and if you are not yet satisfied, please REPLY so I can clarify for you.
Sincerely, Dr. Loretta