OK, thanks for replying.
As has been said here and in other threads, there was a known issue with these locks back in 2013. At the time I liaised with Nissan UK on behalf of the club and they released a VSC (I'm not taking all the credit) to get the locks replaced free of charge - see this notice.
Recently I have been back in touch with Nissan UK because we've had a few cases arise again within the club. So Nissan Customer Services are now looking out for failures and these will be highlighted if you report the issue direct to them, rather than via your dealer.
Therefore, I would urge anyone with a steering lock issue to report it to Nissan CS rather than just take it to their dealer to repair. By all means get your car to your dealer, but raise a call with Nissan CS and get a reference number.
For reference, here is how to contact Nissan Customer Services.
I contacted Nissan customer service and they gave me a reference number they are contacting me on Wednesday.
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