Play in steering full lock

Since getting my Disklock for my steering wheel I tend to put it on full lock to try and make it difficult to be dragged away and stolen.

When on full lock I have a couple of inches of play on the steering wheel.... when pointing straight I have no play.... no other issues with steering. Don't recall any play in my last 90 when on full lock....... should I be concerned something is worn?

That’s normal, maybe a little more than I would expect but not a huge issue. Unless you do a lot of high speed full lock driving and require highly sensitive control I don't think it will cause you any issues, remember for an MOT it's always tested with the wheels straight ahead.