Mettle say they are the business bank account built for the self-employed and are backed by NatWest. Customer Reviews Write A Review Tell us what you think of this provider. Your review Your overall rating Select a Rating5 Stars4 Stars3 Stars2 Stars1 Star Title of your review Your review Your name Your email This review is based on my own experience, is my genuine opinion and I agree to the Good Money Guide terms, conditions and privacy policy. Submit Review There are no reviews yet. Be the first one to write one.