NR230 is the code for a change of name other than by marriage. AUA is the registration district area code for Southwark, and the date of 17^th April 1947 was when the change was recorded.

So it appears that Ernest SMITH has had a change of name recorded in the register as Hugh Charles SMITH on 17^th April 1947 at Southwark, for whatever reason.

See the following links:

https://blog.dearmyrtle.com/2020/12/peculiar-codes-in-1939-register.html

https://www.findmypast.co.uk/articles/1939-register-enumeration-districts

https://www.nationalarchives.gov.uk/help-with-your-research/research-guides/1939-register/#7-why-do-some-entries-show-the-married-names-of-women-who-did-not-marry-until-long-after-1939

Phil