BBC Moneybox - contactless hiccups

[Roland Perry]

In article <57621A3A-56C8-4517-B41E-6DFEB0314A98 at gmail.com>, Fearghas 
McKay <fearghas at gmail.com> writes
>> So,  does that mean we now need to have mu-metal lined wallets?
>
>Like your passport holder :-) that probably has room for cards already

I wonder if it helps (to avoid these false transactions) if you have 
more than one contactless card in your wallet. Or does the system then 
simply charge both of them?

What if the contactless credit card is adjacent to an Oyster or ITSO 
card in your wallet?
-- 
Roland Perry