And the first proper post is a very practical one. I spend a lot of time cycling, and when I go longer distances by train, I like to take my bike with me. This can on occasion be a screaming nuisance. Broadly speaking, local trains don't require booking (and will usually have some variety of bike-space, of greater or less usability), but long-distance/Intercity trains do require booking. Booking these days is free, but most of the online ticket sites don't have a bike-booking option, which means either booking in person, booking by phone, or phoning up after you've bought the actual tickets (which can be... complicated, depending on who you speak to).
Whilst on the subject of bikes and public transport, two questions:
1. Is there a good reason why the old-fashioned guard's van (with lots of room for bikes and other bulky objects) can't be brought back on modern trains?
2. Whilst in San Francisco a few months ago, I noticed that MUNI buses have bike-racks on the front (explanatory video also available). This is a genuinely awesome thing. I find myself wondering: are these things fittable post-hoc? Could London's buses (and other UK buses) be fitted with them?
* I can't comment on disability-usability issues - would be interested to know if anyone else can.