FYI for anyone wanting to get a non B at Liverpool UK you need to call them, they will send you an email requesting you scan and send the documents to them by email. They then send it to London to be pre approved and then offer you an appointment to collect. £70 for same day collection.
Side note- the guarantor, I put my mother for UK and left Thailand blank.
I sent it yesterday, it was approved and I received my appointment within 4 hours!
TLDR : Answer Summary
To obtain a Non-B visa in Liverpool, UK, you need to call the relevant office. They will request your documents via email, which must be scanned and sent back to them. The office will then handle the submission to London for pre-approval. After approval, you will receive an appointment to collect your visa, which costs £70 for same-day collection. A guarantor is required, and one individual used their mother for the UK while leaving the guarantor for Thailand blank.