Here are the required stations: Manor House, Boston Manor, Ruislip Manor, Mansion House, Tottenham Court Road, Earls Court, Barons Court, Ravenscourt Park, Custom House for ExCeL, Limehouse, Ruislip Gardens, Kew Gardens, Island Gardens, Covent Garden, Crystal Palace, Elephant and Castle.
Rules: The stations must be visited using a Tube Train, a DLR train, or an Overground train, but similarly to the Full Network, the same tracks rule applies. To clarify, Kew Gardens naturally can be done by either Overground or Underground, Limehouse must be done by DLR, and Crystal Palace can be done using a National Rail train that uses the same tracks. I am uncertain, however, about precisely what would count at Crystal Palace, hazarding a guess (based on metro.carto) I would suggest trains from platforms 3, 4 and 5 are valid. If someone with knowledge of the station could clarify, this would be useful. I do not believe there is any potential confusion at any other station.
You may start from ANY station served by the Overground, Underground, or DLR, and you must start within a half hour time frame, the time of day which this will occur will be decided later. The time starts as the doors close at your preferred starting station.
Your last station may be any of the ones required for the challenge. The timer will stop as the doors open upon arrival at the station, or, if you arrived at the station by means which doesn't 'tick it off', (on foot, by another train service etc), as the doors open at the next called station after boarding the required train. As an example, if your last station was Limehouse, which you arrived to on national rail, you would have to board a DLR train to either Westferry or Shadwell, where the timer would stop.
Due to the vast distance (20+miles!) and potentially vast times (I'm competing) between each person or team finishing the challenge, it is strongly recommended that at least one member of each team carry a charged, credited mobile phone, so that they are contactable and are able to contact in order to get an estimated time of arrival to the meeting point. This is for organisational and courtesy purposes. As a large proportion of the challenge is overground, (only 5 of the stations lie below the surface), and as ending points (I predict) will be mostly overground, signal shouldn't be a problem late on in the challenge.
Unless there is a better suggestion, I reckon the Horse and Groom is a good, central meeting place for after the challenge. Unfortunately it may take around 50 minutes to travel to from your finishing station, alas, that is the nature of the stations involved in the challenge. You should shoot whoever decided to suggest the inclusion of Crystal Palace
I think that covers most things. Please, please do comment to point out inconsistencies, loopholes, or things that need clarifying.
Which dates from the 29th to the 2nd are people available? From the other thread, I have read that GU may be able to do 30th to the 2nd, and that Rhys1995 may be able to attend. I imagine that I will be available for all the dates, but would possibly opt for midweek out of preference. I will also check with my parents that one of the days isn't already booked up, I do doubt it though.
Prize: I may provide a small prize and certificate
(if I am feeling generous).
First and so far only female solo record holder!! 
