25Avalon
After you have used your contactless cards a number of times most banks will require a chip and pin entry before you can use it again. I have a M&S contactless card and occasionally their fraud squad will question me about certain transactions - apparently they check for unusual transactions on an account.
I must commend M&S for their vigilance.
On holiday in the summer I was making a purchase, which was unuaual for me. My card was immediately blocked until I confirmed that it was me, spending a fortune in a boutique in a seaside village!
Last week I lost my credit card, I was able to deal with all in minutes on the banking app, without speaking on the phone.