Changing spark plugs

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In addition to Ferret's comprehensive description i would like to add some pictures to illustrate, i have just removed the inside plug and found;

small rocks inside the sparkplug well just to the right of the spark plug;


The ratchet does work in the confined space, one click at a time but do the rest by hand;


And easier with a "wobble extension";


and the extension;


So there is a risk of debris ending up inside the cylinder, unless you can prevent this it may be time to postpone until the area around the plugs can be cleared out completely, i used an empty weed sprayer which had enough of a blast of air to clear all debris out and the reach to get in behind the spark plugs.