I used to live in London (8 years ago) and I did exactly this because of the Jubilee line. I had written a perl program rss.pl that I would give several URLs to generate custom RSS feeds for those websites that provided poor, summary only, feeds. I had it running in a crontab and just posted the feeds to my own webserver. This brings back memories. I live in Tokyo now where there is internet access everywhere so I retired my perl program.