It simply seems to be a server problem. The Companies House website isn't showing anything worrying. Further, if the company had ceased trading, it should appear on this list:
http://www.caa.co.uk/...atid=1052&pagetype=87
(If the website isn't back in the next day or two it might be worth checking on that ATOL list to see if Enable Holidays has been added to it, but I stress that the most likely cause of the website's disappearance is simply a server error).
Thankyou,I have checked the ABTA and ATOL list and glad to see that they are not on the ceased trading list. I will ring them tomorrow if my flight tickets don't arrive in the post,due to fly in 9 days time.