Google is testing a credit card comparison service… but if you want to try it you’ll have to be really lucky. Oh, and in the UK too.

Last October Google launched a new form of ad that lets users compare prices on products. Essentially Google Product Search but for financial services and with more options for choosing your perfect product, it only worked with US mortgages. Now Comparison Ads are being tested again, this time in the UK for credit cards. Once again though, you’ll only get to try it if you get lucky when you search for credit card related keywords.

Users searching for credit cards see an ad (if they’re lucky) prompting them to click through to to a chart comparing prices from a number of providers. After entering a few basic facts like age and household income they can choose the best price.