Expires 4 months after purchase. Limit 1 per person, may buy 1 additional as a gift. Booking required online on https://www.londonsaltrooms.com/book, provide Groupon codes. Present printed Groupon on arrival. 24-hour cancellation policy. May be used over multiple visits; please allow 24 hours to schedule all appointments within the validity period. Valid Tue-Fri 10am-8pm. Please contact the merchant directly prior to purchase for information on any special assistance required, including step-free access. Must be 6 months or older. Under 18s must be accompanied by an adult. Not suitable for those suffering from an acute stage of respiratory attack, stage 3 chronic obstructive pulmonary disease, alcohol or non-prescription drug intoxication, cardiac insufficiency, haemorrhage, stage 11b hypertension or haemoptysis. Excludes bank holidays. Valid only for option purchased. Verified using our merchant's website on 25 Feb 2019. Merchant is solely responsible to purchasers for the care and quality of the advertised products and services.