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I posted the anglia trains link above, there's a page on their website somewhere, but it looks less generous than before.
Backstop-
Yes, Yemble quotes from that page:
http://www.abelliogreateranglia.co.uk/dunwich-dynamo-restrictions
"Due to the growing popularity of the annual Dunwich Dynamo cycle event, and to maintain a punctual and safe service, Abellio Greater Anglia will this year introduce partial cycle restrictions on its network on Saturday 4th and Sunday 5th July. A question and answer section is at the bottom of this page."
It's just the usual thing, not quite as radical as what happened to the London-Brighton service, but still a shame that their reaction is to introduce partial restrictions. They did try to lay on extra carriages on the East Suffolk line (might have been two years ago) but for some reason I think it didn't work too well. @Miss_Mouse might remember what happened.
Oliver Schick
I don't know what's going on with the trains, Yemble. Southwark Cyclists tried to work with the train company in past years, but I don't know if they're doing it this year. I can ask if you want me to?