This occurred a couple of days ago and users should always avoid replying to bank related email message directly (call them directly if you're unsure). 

Barclay's Phishing attack - Panda issues Orange Alert
http://www.pandasoftware.com/about/press/viewNews.htm?noticia=7777
 
ORANGE ALERT: PandaLabs warns about BarcPhish, a large-scale phishing attack targeting Barclays Bank clients and involving 61 variants of spoofed emails. Given the number of variants detected, there are an estimated several million emails in circulation.  64% of phishing messages detected by PandaLabs over the last few hours target Barclay's clients. The number of phishing messages normally detected by PandaLabs has increased 30% due to the magnitude of this attack