4 x adult tickets for a sight seeing tour round london ?

here im selling 4 x adult tickets for a sight seeing tour round london, my sister brought these as she was going to go with 3 of her collegues from germany but after purchasing them they let her down, they cost her £140 there are 4 different routes that can be taken visiting all the well known locations its hop on hop off facility ie you can get off at every stop to look round then catch the next bus which leave at 25 mins intervals this is ideal for a day out,or as a gift for someone(mothersday is just round the corner) these are valid till the 31/03/2012 so still time left before they expire im open to sensible offers so please contact me if you have a offer in mind now selling for £70