Mail crashes on open click on a specific email

I have a MacBook Pro running Yosemite. I have received two emails from Premier Inns, (a site which I have subscribed to,) on 22 April and 25 April. Every time I click to open these two specific emails, Mail crashes, with the message "Mail Unexpectedly Quit" displayed with a heap of mumbo jumbo following afterwards.

I have tried to speak to Premier Inns on the phone but the only number displayed on their web site connects me to booking a reservation agent, and I have asked them to request their IT department to call me back but no joy.

I have already followed advice for fixing a crashing Mail programme on this site and rebooted the MacBook Pro in safe mode, but it still crashes when clicking to open these emails.

I have the same emails on my iPhone but they do not cause any problems on that device.