First of all, a friend checked with an antique appraiser and he said the Heron's ones were by Patrick Heron. However, all I can find is paintings, paintings and more paintings. One of his daughters is a sculptor but does large installations.

And Karen, a magnet does not stick to the heavy cat at all.

ETA: found one, although the Heron's label is not on it! http://www.ebay.ca/itm/Cat-Kitten-Figurine-Statue-with-a-Jug-Pitcher-of-Milk-Made-in-Britain-4-Tall-/181538944151?pt=LH_DefaultDomain_0&hash=item2a44907497