Not sure you will find UK guidelines. The obvious places to try are the British Thoracic Society
or the Association of Respiratory Technology
however could not find a reference. In the States the equivalent is the American Thoracic Society and their statement can be found through this Link
9.1 Quality control:(21)
9.1.1 Volume verification (ie, calibration): at least daily prior to testing, use a calibrated known-volume syringe with a volume of at least 3 L to ascertain that the spirometer reads a known volume accurately. The known volume should be injected and/or withdrawn at least 3 times, at flows that vary between 2 and 12 L/s (3-L injection times of approximately 1 second, 6 seconds, and somewhere between 1 and 6 seconds). The tolerance limits for an acceptable calibration are ± 3% of the known volume. Thus, for a 3-L calibration syringe, the acceptable recovered range is 2.91-3.09 L. We encourage the practitioner to exceed this guideline whenever possible (ie, reduce the tolerance limits to < ± 3%.
Agree this should be a user function however we have a traceable reference Calibration Syringe which is used on annual PPM's or when equipment is sent into the workshop. Would not expect our team to going out 'daily or monthly' to do this task.