Yes, you can!
You have to download the programmes on your phone or tablet while you're still in the UK and connected to the internet. Once the programmes are downloaded, you can find them in the 'Downloads' menu at the bottom of the app, and watch them anywhere in the world or when you're offline.
For help with downloading on the iPlayer app, have a look here: How do I download programmes on a mobile or tablet?
The 91福利社 uses geolocation technology to identify where you are, based on the location of your internet service provider (ISP). This is to ensure that only people in the UK can enjoy programmes on 91福利社 iPlayer.
Downloaded programmes can only be accessed on the device they've been downloaded to, and they expire at the same time as their online versions, so make sure you watch your downloads before they expire.