Hello again, Bearface
Myanmar (Burma) doesn't appear on the Foreign & Commonwealth Office list of 'don't travel' destinations:
http://www.fco.gov.uk/servlet/Front?pagename=O penMarket/Xcelerate/ShowPage&c=Page&cid=109542 3800990
but they do advise a certain amount of caution
http://www.fco.gov.uk/servlet/Front?pagename=O penMarket%2FXcelerate%2FShowPage&c=Page&cid=10 07029390590&a=KCountryAdvice&aid=1013618387126
The Myanmar Tourism Promotion Board might be able to offer you some assistance. Use the 'Contact Us' link here:
http://www.myanmar-tourism.com/mandalay.htm
The only international flights directly into Mandalay are with China Eastern from Kunming Airport, in China. That's not a convenient route from Europe, so you'll have to travel via Yangon (formerly Rangoon). There are no flights to Yangon (or anywhere else in Myanmar) directly from Europe, so you'll have to travel via Bangkok or Singapore .
For some random dates I've tried, Thai Airways will get you from Heathrow to Yangon (via Bangkok) for �721.30:
http://www.thaiair.com/index.html
Then Yangon Airways can get you from Yangon to Mandalay for US$84 each way:
http://www.yangon-airways.com
Chris