Mr. Malcolm's List is a Regency romance. Possibly a Regency romantic comedy? I bought my copy brand new.
Review:
Mr. Jeremy Malcolm, second son of the Earl of Kilbourne, is a much sought after bachelor, but no one seems to be able to catch his eye for long. When his best friend, Lord Cassidy (known to friends and family as "Cassie"), asks him why he rejected his sister Julia, Malcolm admits that he has a list of qualifications for his future wife, and Julia didn't meet all of them. Plus, her attempts to flutter her eyelashes at him flirtatiously just looked odd.
Although Mr. Malcolm only escorted Julia to the opera once, she took his rejection hard, and Cassie's news that he has a list of qualifications that she failed to meet leaves her seething. Julia, schemer that she is, comes up with a plan: she'll invite her friend Selina for a visit, set things up so that Selina meets all of Mr. Malcolm's requirements, and then have Selina crush him with a list of her own requirements that he doesn't meet.
Selina, a vicar's daughter, hopes that visiting her friend Julia in London will allow her to make a good enough match that she'll be able to sponsor her younger brothers and sisters. She wants nothing to do with Julia's plan once she hears about it, but she doesn't really have much of a choice. Also, she figures it's unlikely that an arrogant-sounding man like Mr. Malcolm would fall for her, so she's surprised when she meets him and he doesn't seem anything like the person Julia described.