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Flattest Possible 300 was my first 300 (fixed too). Great ride, the 2am start down the A-roads to Ashford and then Folkestone is great fun. The train to Pluckley is fun too as (from memory) it was the last train towards Dover and filled with semi-drunk people (no hassle from anyone, all good natured chat of the "how far?" kind).
(It's the last 300km of this ride [I did it again as part of a DIY600 a good few years ago]: https://www.strava.com/activities/163185836 note the nice long flat sections down near Dingymess).
Looking at the Fairies Flattest Possible 300 as my next 300. Just got an email back from the organiser saying that the hall is open from midnight. Ride starts at 02:00. Makes it so much easier to get a train out there.
http://aukweb.net/events/detail/15-859/