I believe there was a plan in 1958 to use napalm against the insurgents in the Radfan Mountains. However the only capable aircraft of the period were Hunter 6's using converted drop tanks and none were based in Aden at that time.
During WWII it was found that napalm was far more effective than rockets or cannon in destroying moving columns of vehicles and armour. The terror factor was also significant and particularly so in the Far East. I am not aware of napalm being used by the RAF in Europe but flame throwing tanks were in extensive use.
In the mid 1970's napalm was dropped on the stricken tanker Torrey Canyon when it went aground on rocks off Lands End in a vain attempt to set it alight.