Re: Mistakes Happen
It turned out that the builders had different plot numbers to the actual house numbers (WTF?),
Not all that unusual. Where I live they extended an existing road and added a new cul-de-sac as well.
Plot 1 became 23 xxxxx Road, Plot 3 became 1 yyyyy Close. There was certainly potential for confusion as initially the post code databases only new the plot numbers.