Spark plugs
The spark plugs can become very seized if they have been there a long time. If the engine isnt misfiring on cylinder 5 I would be tempted to leave it for now.
But if you wanted to try and replace it I would try and get the engine nice and warm and then try to release the spark plug with a long breaker bar....but you want to be careful not to break the spark plug, however u may be unlucky and someone may have cross threaded the spark plug.
The only other option is to remove the head and have it drilled out. But if you are going to have the head removed then you might want to think about renewing the intake manifold gaskets and changing the cambelt at the same time, I wouldnt worry about water pump and thermostat at this moment in time.
Mind you it might be worth thinking when the cambelt change is due cos you would probably be better off removing the head then.
If you do decide to take the head off and sending to a machine shop proves expensive, then I have one in my garage from an AVP engine which is spare.
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