Fluoride varnish application is appropriate to band 1 treatment.
As with any Band 1 claim, an examination and completion of the planned treatment (that the patient is willing to undergo) is a requirement.
The recall interval for this CoT is based upon your own clinical judgement. The document 'Delivering better oral health: an evidence based toolkit for prevention' provides guidance for frequency of fluoride application.
More information can be found on NHS Dental Services website.