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In September 2019, 148 295 people attended compared to 140 364 in the previous year. That was a 5.6% increase in demand yet 89.3% were seen within the target time in 2019 compared with 90.9% in the previous year. The latter difference is of course not statistically significant.

https://www.isdscotland.org/Health-Topics/Emergency-Care/Publications/2019-11-05/Summary/index.asp

The figure for England is 77%.

https://www.england.nhs.uk/statistics/statistical-work-areas/ae-waiting-times-and-activity/ae-attendances-and-emergency-admissions-2019-20/

12.3 is 15.6% of 77 so, using RSD rounding, we get 16%.