Have fun - sounds like a great experience!

If it were not for the fact that I've never done anything like that distance, have very little experience of night riding and am
rather very slow, I'd have loved to have joined in. Maybe next year...
It's unlikely we'll do another until maybe March - the risk of ice increases for the next few months. Build up some distance between now and then, and you'll be fine. As CL says, we weren't all that fast (my average for the whole ride was a shade under 10mph). There's a first time at night riding for everyone - I was a bit worried about the first, but the cameraderie and other people's super dooper lights made it easy. I'm putting a Hope 1 on my Christmas list I think.
Once you can do, say, 30 miles, then 50 isn't such a big leap. If you can do 40, then you can do 50 in a group with that 'special event' feeling.
Banjo - I think you maybe have to try it to understand. Although I did see the attraction before, it wasn't until I did the ride to Scarborough that I really got it. The peace is amazing - roads aren't just 'quieter', they are frenquently empty, for an hour at a time. And it's true you don't get the view, but it's replaced with something else - the little bubble of light around you, the disembodied bobbing of lights and reflective trim ahead of you - your only clue to any hills ahead. If you chat, that's fine, but when road turns upwards, and the conversation drops, you just have companionable silence. On a clear night, out of town, there are stars galore, and then that first hint of light in the east that says you've ridden to dawn. And by heck, you've earned your breakfast.
I'm a convert, I know, with a convert's zeal. But I'd say to anyone, give it a go if you get a chance.. I really must try and get down to a London FNRttC, to find out what it feels like to be in the company of 50 or 60 or more likeminded people.