The biggest difference between AirPlay and AirPlay mirroring is that when mirroring, the content is going from the internet to the iPad and then to the Apple TV. With "regular" AirPlay, the iPad initiates the stream, but the bulk of the data is actually flowing between the internet and the Apple TV directly, leaving the iPad out of it for the most part. More efficient, better quality, better on battery, etc.
BBC has a lot of great content. I like the documentaries, concerts, etc. To get the BBC, you'll need to have a UK iTunes account. You can set one up for free and without providing a payment method, and then you just use that account to download the BBC iPlayer app from the UK iTunes store. As long as you're using Unblock-Us or similar, you'll be able to watch the content. Some other good UK ones are ITV and Channel 4 (or 4oD or 4 on Demand as it sometimes called).
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