four days in the UK:
I'm headed to London Monday, arrive tuesday, my friend is going to pick me up from the airport and I'll stay two-nights with her at the south end on the sea,
on my 3rd day we both we'll come back to London center, by train, when I buy that train ticket into London center, does that train ticket qualify for the 2 for 1 specials? and do I have to print a coupon or voucher before leaving? does a one-way in ticket count as the paper ticket?
the oyster - so while I'm at Heathrow, I should also buy a oyster card and put $10 pounds on it?
my fourth day - no discounts like 2 for 1 because we have no paper train ticket?
many thanks for your guidance !