It has been available in The UK but it's very, very rare and next to impossible to find. It's probably all sold out now. Argos (big UK catalogue shop) had it for sale.
Samsung never bothered to sell their BD-UP5000. Only the LG BH100 has been readily available in The UK.
Sadly LG had no faith in their Combos products outside of North America, where the market is much bigger. America alone has roughly the same people as the entire continent of Europe but Europe is lots of little countries, whereas America is one big market.
Combos sadly got a bad reputation so LG only decided to sell the BH200 in very limited numbers. The cost of producing a Combo Player is higher than a BD Player too meaning they had to either sell them at a price point most don't want to pay or sell at a loss (which is currently the case).
I heard a few months back that they'd only sell them to UK retailers in batches of a dozen and that was simply to risk for most retailers.
It is however easily available on eBay.com to The UK or several Mainland European stores in Belgium and Switzerland:http://www.avforums.com/forums/showthread.php?t=756827
I bought mine from Belgium as I wanted a guaranteed warranty and no power supply issues. It even came with a warranty specifically mentioning the UK.
It's much cheaper imported from America but your warranty will probably be void and you'll need a voltage converter.