I would suggest playing the "long game" and try not to do the typical "I need to get success today" approach, which could come across "needy" and unprofessional
I would absolutely have some CDs, memory sticks, cards etc. on you in case "that" opportunity comes up
BUT
I would suggest making your first goal trying to "open the door"
I would suggest just trying to get a few decent contact details and asking if you can send them some songs
This will then enable you to send "solicited" emails that can start with "Hi, we met at the seminar in Westminster last week and I said I would send you a few songs that I think are suitable for that exciting project you were talking about" etc. etc.
Remember, when pitching if the first 30seconds of a song gets listened to you will be doing well so pay attention to your starts and avoid long intros
I really liked the feature on AudioRokit where it had a "chorus blast" feature where the person listening could just listen to a pre-defined section (ie the chorus/hook)
I think SoundCloud allows you to send links starting at a specific section/time so it may be worth sending this - I haven't explored this option myself yet but is definitely something I would consider when sending pitches via email
If there are still spaces I am toying with coming along, it would be great to meet up