BBC iPlayer, is an online British television and radio service that is available on both the computer and the mobile device. Available free on UK territory, BBC iPlayer is also a video-on-demand platform put online at the end of 2007.
BBC iPlayer's Geographic Restriction
BBC iPlayer is only available in the UK. If you visit the BBC iPlayer site outside UK, BBC iPlayer will display an ad as below:

As BBC iPlayer explains on its official website, BBC iPlayer uses "Geo-IP" technology and identifies the location of a user by locating its Internet service provider (ISP).
Therefore, to circumvent the geographical restriction of BBC iPlayer, simply change its IP address with a UK VPN. Because a UK VPN allows traffics to pass through a server that is located in British territory to obtain a British IP address. Thus, BBC iPlayer believes in the UK itself that we are not.
Unlock BBC iPlayer Outside the UK With VPN
Today, people watch BBC iPlayer rather on touch tablet than on PC. So it is better to find a reliable VPN provider that offers the Android VPN and iPad VPN to unlock BBC iPlayer. About the Android VPN provider and iOS, I offer FlyVPN, the UK's best provider of VPN. You can click the given link to get 19-day VPN United Kingdom free trial on Android and iOS. I leave here the link for VPN Free Trial service from FlyVPN, but it is always advisable to buy the VPN service fee to get a more stable VPN service. After using a UK VPN, you can finally watch BBC iPlayer on tablet.