The new UK policy

The new UK policy, however, does not apply to overseas travellers with magnetic stripe cards.  All merchants displaying a Visa logo are required to accept any form of Visa payment that is presented to them.  In the UK, this means merchants will continue to accept foreign-issued, non-chip and PIN cards as before. Visa is committed to enforcing this policy to helping maintain cardholder trust and confidence in Visa's promise of unsurpassed global acceptance.