This guideline doesn’t really add anything new. It is very similar to the recent FSRH summary on Vaginal Discharge.
Oral Metronidazole is still the treatment of choice because it is cheap.
The main difference from the recent FSRH guidance is in BV in pregnancy. FSRH advised treating in pregnancy, even if BV is found as an incidental finding (ie the patient is asymptomatic). BASSH only advice treating if the lady is symptomatic, or if the patient is under 20/40 and has other risk factors for pre-term delivery.