Should you be looking at cycling straight back, as part of LEL training? Theres always bus shelters if needs must?
Sensible people look away now......
For what it's worth, which is not very much, I shall "enter" a one-man "do-it-yourself" Audax event starting in Hull and ending near London, a distance of 300k and a bit. Because of the minimum speed requirements of an audax event, if you include a FNRttC in your "DIY one-man audax", the slowness of the FNRttC with the midway stop and the regrouping means you need to ride the rest of the route at a fantastic speed to get faster than the 13.4kph minimum overall for an audax event. So it makes sense to just enjoy the FNRttC, have a kip in a hotel and then set off and start the audax at the hotel.
Doing the FNRttC, and then using up time by sleeping in bus shelters etc will mean you could not do the whole thing in overall minimum speed for an audax, so is not good LEL training, which is also about speed (as well as distance, obv). You need to go fast enough during the 119 hours allowed for the 1,400k to get enough sleep to continue to function (brain as well as body), it's not just about distance.
Because you are allowed 7 hours for a 100k distance, you get 21 hours to do the 300k Hull to London and as I need to arrive in London before the trains stop on Sunday night so I can get home to Kent's leafy suburbs, I need to start about 10pm on Saturday night. This obviously involves riding through the night. This is the point: if you set off from Hull at say 9am after breakfast you'll arrive 300k later on the outskirts of London about 6am on a Sunday morning when the trains are not running. So I think it makes better training to sleep and then ride back through the second night and the full day, which is closer to how LEL is likely to work out. And just to prove my earlier point that it's not worth much, you also get a precious 3 audax points and complete a 300k at audax speed, which is part of becoming a Super Randonneur (a 200k, a 300k, a 400k and a 600k in the same year) and completing a Randonneur Round The Year (RRTY) which is a ride of 200k or more every month for a period of 12 months. (As of now I have five months done, in this, my third attempt. Other years have been disrupted by weather and Real Life.)
That's why bus shelters are not a good option.