You can also catch it on youtube shortly after it airs. You have to be fast because it will be taken down for copyright, but it will be back a week or so later. (there will be loads that are fake just trying to get you to their website to try to shake you down, just go to the next link.)
Google a youtube recording program.
Another way, if you have a smart phone, download MOBDRO from the play store. Sorry, don't know if it is available for iPhone.
If all else fails, search for online bbc2 stream. You may need to use duckduckgo or similar but last year I found several free sites to watch bbc2 for something else ? I was watching at the time on google.