Hello, my name is Ben and it is my pleasure to assist you with your question today.
Unfortunately your GP is legally entitled to remove you from their list in the circumstances. If you have moved out of their catchment area they are no longer obliged to keep you on their books and can remove you from their list and ask you to register with a different practice. However, they need to give you at least 30 days' notice of the proposed removal to enable you to make alternative arrangements. You can get official confirmation here:
You can write to the practice to ask them to reconsider their decision but that is done entirely at their discretion
I hope this has answered your query. Please take a second to leave a positive rating, or if you are unhappy for some reason with the advice - please get back to me and I will assist further as best as I can. Thank you very much