With the increased focus on Safety, any activity involving a waiver needs to be validated by Unity (the Scouts insurers).
Please email hello@unityins.co.uk and copy in harvey.gogan@unityins.co.uk.
You will need to give details of the activity (eg, 1st Harpenden Scouts would like to take part in an obstacle course run by OTG on date).
Please also give details on how Unity can check the blank waiver (eg attached the document or give a weblink).
They will check the activity provider and should get back to you on a couple of days