Hi, DavidNeville. I'm Robinson, and I’m happy to help you today.
Disabling the "Time to display list of operating systems" in the system advanced settings should disable this screen.
1-Right-click on Start then click on Run
2-Type: sysdm.cpl and click on ok
3-Click on the "Advanced" tab
4-Click on the "Settings..." button under "Startup and Recovery"
5-Uncheck the option "Time to display list of operating systems"
6-Click on Apply and Ok on both windows to save the change
7-Then you should not see this screen again when rebooting your computer