Yes, £1650 is a lot of money to raise but it is achievable otherwise they wouldn't ask for so much. I was so determined that 2002 was to be the year I ran FLM that I had to go for a Gold Bond place when I didn't get throught the ballot. I pledged to raise £1500. I wasn't working at the time, have no children so fundraising via school was out, and being a relative newcomer to the area don't know many people locally. However, I raised £1741.60 so it's not impossible.
When it comes down to it, no-one forces anyone to take a Gold Bond place but in an event like FLM, so many people want to do it that the charities can almost guarantee being able to get people to raise whatever amount they ask.