I have shipped to UK, Portugal, Argentina, Holland, Canada, etc. The fees are not that much higher. You can insure for the same fee. The only slight problem I ever have is payment. Sometimes they send me International M.O. which can take longer to cash, but my bank cashes immediately which is a nice service because I have been with them for 19 years. One guy sends me cash inside a foreign magazine. Several use PayPal. No one has ever suggested personal check.
There is a customs form to fill out, that takes less than 1 minute to fill out. My customers are very grateful.