[問題] 倫敦2 for 1 優惠疑問

[PhoenixDance (新生活)]

對於2 for 1的規則有幾點疑問

目前我了解到的規則是:
1.如果使用travel card一定要在火車站買紙卡才能使用2 for 1優惠
  使用天數就如travel card天數 很好理解

2.如果是火車票 當天進倫敦的火車票可當天使用
  比如:愛丁堡到倫敦的火車票 可當天使用2 for 1優惠 這也很好理解

3.從外地來的 若持有到倫敦的來回車票 這段期間都可使用
 比如: 6/1從愛丁堡到倫敦+ 6/6從倫敦回愛丁堡 的車票
       那從6/1~6/6都可出示這兩張車票使用2 for 1優惠

If for example you are buying single tickets, e.g.Advance tickets to London
 for a one-way journey on a Monday, and Advance tickets for departing London
 on a Friday you will be able to use the vouchers during the Monday-Friday
period, provided you show both outward and return tickets (remember to tell
 the train company staff that you need to keep your outward tickets!).


4.從倫敦出發的來回車票似乎也可使用???
If for example you buy Return tickets to London, outbound on a Monday and
 returning on a Friday, you will be able to use the vouchers throughout
 the Monday-Friday period, provided you show both outward and return
portions of your tickets (remember to tell the train company staff that
you need to keep your outward tickets!).

所以如果6/1倫敦到愛丁堡 +6/6愛丁堡回倫敦
持有這兩張火車票 從6/1~6/6也都可使用2 for 1優惠

這個...勉強可以理解 因為2 for 1優惠有些是倫敦以外的地方?


請問我以上的理解對嗎?
照官網的說法，似乎一定要持有"來回票" 才行??單程票就不可以??
倫敦市區內的火車票可以嗎??因倫敦市區內就有幾個火車站
  如果這幾個站短短來回或單趟也可以嗎?
  因為網站上好像沒有說明到底要多遠的火車票才算數
如果倫敦市區內的火車就可以的話 我豈不是可以搭個一站就算數?


有請高人解惑~

附上2 for 1的FAQ網址
http://www.daysoutguide.co.uk/faq.aspx#1

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◆ From: 114.33.142.144
→ ahyang:point 3 is about using 2 SINGLE tickets acting as your
→ ahyang:return ticket, and point 4 is about using your 2
→ ahyang:portions of the RETURN ticket. in practice, any valid
→ ahyang:ticket can be used as long as there's national rail's
→ ahyang:two arrows mark on it regardless the destination of
→ ahyang:your ticket. you can indeed buy a ticket from, eg.,
→ ahyang:vauxhall to waterloo for the 2 for 1 offer whether you
→ ahyang:travel on the train or not.
→ ahyang:any national rail ticket valid on the day can be used.
→ PhoenixDance:I see! thank you so much!