Scottish are only giving 'clearance' in respect of airspace above FL195, which is Class C and requires a clearance. Below that, we can't legally tell people to steer clear, nor stop any launch activity.
However, duty of care means we do tell pilots about the activity and our instructions state we should not let aircraft under our control enter the area. Unless in receipt of a Control Service, i.e. within Controlled Airspace, or receiving a service on the published Advisory Route (where pilots are expected to comply with instructions) that's something we can't legally enforce if the pilot decides he wants to do otherwise.
Applying Airmanship should allow the pilot to calculate the risks and make an appropriate decision as to avoidance (or not).