Ok, jumping off!
Here is a two scenario campaign.
The first scenario is a one turn long "filler", No 14 Commando, reinforced with a tank platoon, embark the transport ships bound for Ibiza.
The second scenario represents the actual invasion.
Your mission is to secure the Ibiza town harbour and the nearby air strip.
Enough landing craft to ensure a resonable freedom of movement have been provided.
You also have some smaller naval craft to close in AA protection as it is possible Spanish air flying from Mallorca might interfere.
You have naval gunfire support on call, including the 15in and 6in guns of HMS Valiant. The Americans will fly Close Air Support with their B-25s (ignore all penalties for overuse of artillery).
The Commandos are high quality troops but weak in manpower, but with naval and air support they are belived able to beat the Spanish garrison.
However, already in Algiers it becomes evident that no surprised can be achieved for OPERATION OXCART.