Yes, it was a fabulous night out
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No Bromptons on this ride and I can't actually remember any in the past although, IIRC, Redfalo did it on a Moulton.
The climbs and the descents are better suited to a big wheeled bike (IMO).
AIUI, LCC membership provides the insurance that you need. All you have to do then is send £2 to The Fridays as part of the affiliation to CTC. The £2 covers 12 months worth of FNRttC. There's a Paypal link on the Fridays web-site.
Someone more knowledgeable that me will be along shortly if I've got any of this wrong.