A week or so back, I was heading out to Gatwick to get some photos and I checked Planefinder to confirm flights were landing from the West and "watched" a Virgin A330 approaching and then aborting the landing when almost down. The aircraft spent some time in the WILLO hold and, after a detour over Kent, eventually landed. It transpired it was experiencing problems with nose wheel steering (the runway was closed for an hour after landing). I was wondering how did they know there was a problem with the steering prior to landing? Does the pilot give the steering a bit of a wiggle once the gear has been extended?