When and where during the worlds? Travel arrangments etc.

Cost me £150. Rupert said he got his for £120 (I think?). I got cancellation insurance (I think? The terms were all in German. I'm good with money), so that's partially why it was more.

the DB website won't give me a quote for the return journey/whole trip, only for the outbound.

did you book as one single journey (London - Berlin), or did you specify the increments?