Generators and Pumps - Generally unserviceable or not working
Doesn't quite seem so seaworthy now, eh? If the Royal Navy wanted to sell it as a ship, they would have sold it to an allied country; in fact, there were plans to sell it to Australia in the 80's, but the Falkland Islands War queered the deal.
The carrier isn't tremendously useful though--it can only carry helicopters and Harriers, not full aircraft.