Are you sure importing is wise in the current economical climate? The pound is so weak that whatever you import will have to be sold at a higher premium to make it worth doing.
There will always be more buyers looking for cheaper bikes than ones looking for expensive ones, and buyers aren't fickle enough these days to buy just because of the brand name – they just want to ride a bike and there's such a huge range of quality bikes to choose from! Of course, there are always going to be people with money to burn on 'boutique' bikes like DeKerf, but there's hardly any of them out there. You have to ask yourself, are DeKerf making bikes that ride better, faster or are more fun than UK Brands such as Orange or Cotic? I doubt it, but I bet they're more expensive.
From what I remember, DeKerf were beautifully made yuppie bikes. If you enjoyed riding your bike more than looking at it then you wouldn't buy a DeKerf. I've no idea what they're like now though…