Apparently David Campbell Bannerman has:

“…been a proud member of the Conservative Party in the past and I am proud to come home to the Conservatives today… I’ve been pleased with the robust stance taken by David Cameron and Conservative MEPs over the EU budget negotiations and I believe that it is Conservative MEPs who are working hard to defend Britain’s interests”

Which is odd given Cameron has done very little to stand up to Europe. Equally meek William Hague welcomed him with open arms:

“I am very pleased that we can welcome David Campbell Bannerman back to the Conservative Party.  The Conservative Party is bringing in people who want to work in the national interest to sort out Britain’s problems. I am sure David Campbell Bannerman will be a valuable member of our team in the European Parliament.”

A UKIP insider said “our problem is now their problem”.

UPDATE: A good spot by Total Politics. This is what David Campbell Bannerman had to say last year:

“Cameron has spent the last five years ditching Conservative policies on Europe… It’s overwhelmingly clear now that trusting Cameron with Europe will be as misguided as trusting Blair on Iraq.”

Ouch.