Proofreader for a 38,000-word epistolary memoir

WE are looking for a proofreader for a 38,000-word epistolary memoir of the author's time as a missionary kid. The memoir includes diary entries, letters, and Biblical reflections. This will be the final edit pass, intended to catch any grammatical or punctuation errors. An editor who is proficient with industry standards in the UK for grammar and punctuation, and who has good attention to detail, would be ideal.

We are looking for someone comfortable with explicitly Christian content who is British and a native English speaker.