Are you sure you want to purchase a London Pass? I know it works out better for some people, but definitely is not good value for others, so make sure to do your calculations, based off what you plan to see/do.
But yes, should have no problems using credit card to buy either.
Noted with thanks. Will probably get a 2-3 day pass only.
From their website
You can buy the London Pass (without the transport element) at the British Hotels Reservation Centres at Heathrow , Stansted and Gatwick airports; the Transport for London Information Centre at Heathrow; or the Hotel and Travel Reservation desks at Gatwick South, Luton and Stansted.
I am sure they will take cards. I'm not so sure that getting the pass will be a good idea for you.
The 2 or 3 day passes are almost always not good value, they work out best for a solo traveler on a longer trip as the pounds per day amount comes down.
If you’re going to buy one, consider buying online and getting the mobile version. They almost always have a sale going on. I checked their website and saw 20% off. I’m sure they’ll have a new sale in June
Thank you for the info @Charlie.
@RojBlake & @dalej42. It costs a bomb really for 2 day pass @.@ but I will try to explore other options. Thanks for the heads up.
@breath will be in london this sunday until thursday
In that case, yes, may be worth looking at those 2 for 1 deals (if there are 2 of you). If you're on a computer, there are threads about them under 'Top Questions about London'. Alternatively, I haven't looked around online much, but there may be other deals online as well.
Have a wonderful trip! London is great! :)