Topical Glyceryl Trinitrate vs placebo in reducing perioperative pain and analgesic requirements in haemorrhoid banding

INTERVENTION: Patients will have a standard dose of Gylceryl Trinitrate (standard dose = 1.5cm strip of the product where the active ingredient = 0.2% glyceryl trinitrate) applied to the perianal region immediately prior to haemorrhoid banding. CONDITION: Haemorrhoids pain PRIMARY OUTCOME: Pain scores: ; ; This will be assessed in the post operative period by the anaesthetic nurses who will assess VAS (Visual Analogue Scale) at 10mins, 30mins and 60mins post operatively as per standard anaesthetic protocol post operatively. ; ; In addition patients will fill a questionnaire before leaving following their procedure where they are asked to rate "anal pain" out of 10 and "general pain" out of 10 (where 1 is labelled as virtually no pain and 10 is labelled as "worst pain possible".) ; ; Patients will hand in the questionnaires prior to leaving. SECONDARY OUTCOME: Colonoscopy findings will be determined ; Following the procedure the Surgeon will fill out a form detailing relevant findings in the colonoscope; Specifically they will fill out a form asking ; ; List the pertinent colonoscopy findings (there will be blank box where the surgeon lists the findings) ; ; List the haemorrhoid findings: (grade:, number:, treatment given:) ; ; Other deal: (if haemorrhoid banding not completed, why not?. Were there any complications?) Complications of intervention ; The most common side effect of the intervention is listed as headache and hence patients will be asked to fill out a questionnaire where they are asked to circle yes or no to having a headache in the post operative period. Perioperative analgesic requirement ; The anaesthetic charts will be reviewed. The type of medication and the total dosing will be recorded for ; 1) pre‐medication, ; 2) during procedure medication ; 3) post procedure medication (within the 60mins post operative period) INCLUSION CRITERIA: those undergoing elective colonoscopy + haemorrhoid banding