Being serious, you found this in Cambridge. Of course, if you bought it in an art gallery there and know which, they might have more, but you could always try contacting Kettle's Yard. It's an art gallery and modern art museum in Cambridge.Even if they don't know of the artist they might be able to tell you what reference work will list him or her.
The only famous artist surnamed Cattermole was George, who was best known for illustrating Dickens, but somehow this doesn't sound his style, even if A is being misread for G !