No reason why the BLS should hurt Cadillac. The exterior is distinctive and the interior looks to be of high quality.
http://www.cadillac-bls.com/Default....&iso=GB&page=8
The other positive point for the UK is that Cadillac are producing Right Hand Drive versions and making them available with a diesel engine. The BLS and CTS are the only Cadillac models available with RHD here, all the others are LHD.
My main concern are the prices. The cheapest BLS models will retail at just over £20,000 and the most expensive, the 2.8 Automatic at £32,000 (multiply by 1.74 for US dollars) i.e. more expensive than the Saab 9-3 and equivalent to Mercedes C Class prices.