seized sparkplugs

lucky enough to have 2 cars one hamb friendly the other not its a v12 jaguar it has a siezed plug anything i can spray or put on the top of the plug to help free it from the aluminum head i really dont want to pull the heads this thing is not mechanic friendly my current solution is to just leave it alone any bright ideas

 

I spayed mine with Gibbs and finally took the impact and the hammer effect removed them. Didn't hurt the threads.

 

If you can get at it a little heat from a propane torch may help

 

Drive it around first and then try again. Its to late now but next time a little swipe of anti sieze.