Some of the ideas put forward here for improved security on bike areas are interesting. I've been touring in Shropshire today, hence my delayed response to this thread. I'm not sure locking the bike to something in the bike storage area is an overly good idea, but there are certainly worse ideas out there.
That space on Voyagers is meant for FOUR bikes?! Give over! IETs suggest the same, and I've no idea how. Given how much the handlebars stick out when the outermost space is in use, the door around the space cannot be shut and the catering trolley can barely get by, based on my experience a good few weeks back. I've not yet endured the bike space on a Voyager, indeed I had an itinerary this morning for a tour in Cheshire that had me on TfW to Crewe then Avanti to Chester. No thanks!
I am curious about the Pendolino bike area, I will have to do a trip using one some time but I do like the idea of it being locked away safely, away from other passengers. Maybe next week, money's a bit too tight currently to do another tour tomorrow.
I must say though, I do like the space for bikes on 397s, nice and easy to use. Same on TP MK5s, and there seems to have been an effort to provide a useful space. Along with pull-down seats for when the areas are not in use. 350s, I like their bike spaces too!