No getting back on the same service you have just left. You must use a real timetabled public transport service although this can be train, bus, London Underground, tram or other light rail. You may also used water based transport as long as it's a timetabled public transport service. No cars, taxis, motorbikes, planes or helicopters. You must not leave the island of Great Britain except where there is a fixed link to an island close to Great Britain. You must leave the station where the previous post left you within a reasonable amount of time (not staying there from Friday evening to Monday morning just so you can get a weekdays only working) although you may remain on a station overnight until the start of service the next day.