During December 2019 in NHS Scotland:

83.8% of attendances at A&E services were seen and resulted in a subsequent admission, transfer or discharge within 4 hours.

https://beta.isdscotland.org/find-publications-and-data/health-services/hospital-care/ae-activity-and-waiting-times/

During December 2019, in NHS England Type 1 (full) A&E departments:

68.6% were seen within 4 hours. *Remember, NHS England starts the clock again after transfer to a department for treatment so this figure is generous.

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