if you need a visa to enter the uk the earliest you can apply for an s2 healthcare visitor visa is 3 months before you travel. In most cases you should get a decision on your visa within a week.
Windows 10 - how to enter bios configuration? Windows 10 keeps the fast startup feature as windows 8. (for more information, please refer to windows 8-introduction of fast startup). Due to this reason, you cannot press f2 to enter the bios configuration when booting the system.
Entering the UK: Before you leave for the UK GOV.UK
you can enter the uk with either a passport or national identity card issued by an eea country or switzerland that should be valid for the whole of your stay.