Whirly, I'm soooo much happier reading about it from your post than from the AAIB site
Just shows the importance of the "full and free" check! And not forgetting the "operating in the correct sense" check.
Since you invited speculation
I would surmise that a small piece of metal (hinge, bolt, fastener, rivet) has worked loose and lodged in an irritating location. Not saying you had a heavy landing, but perhaps the touchdown / taxying caused sufficient bumping / vibration to finally dislodge a loosening component?
three trains plus a taxi
You were probably wise not to try taxying it all the way back to Sleap
