The Foreign and Commonwealth Office operate a system called LOCATE for British nationals holidaying abroad or living abroad. So if a tsunami or terrorist attack occurs where you are have said you are, the FCO will more easily be able to know who is where and provide appropriate assistance.
Only this service is now being terminated due to the low take up on 14 May. I am one of the just over 3,000 British nationals who registered out of an estimated 15,000 residents and 40,000 visitors annually. They say that only 1% of all British travellers have registered.
Travel advice from the FCO is that there is an underlying threat from terrorism in Qatar, although I would say, from personal experience, that the threat is no more than in the UK, and less than post Boston USA.
But I can keep up in touch by following British Embassy Doha news on twitter @ukinqatar and facebook . I have not looked at their facebook page until today, but their twitter posts are a strange mix of diplomatic/political information from William Hague along with the more mundane such as below.