BillieBalloon said:

Two days later you got a letter through the post. Thanks for sharing your info but just one thing, it seems like if you didn't live in London you couldn't go? Was that a requirement?

It's been close to 20 years, I cannot remember exactly how it was formulated, but I do recall something on the original email mentioned the "surprise" was London-related... Whether it was a requirement or not, or whether they screened addresses... I can no longer recall.