New visitor in the garden.

Looking casually out of the window I had a double-take when something suddenly moved among the garden ornaments.This new creature with distinctive creamy white underparts had perfect camouflage hiding between the fake squirrels. It darted about among the ornaments possibly attracted by the scraps of food under the bird table and looking for anything else interesting on the menu.We looked up all the wildlife books and think it's either a stoat or a weasel....possibly the weasel as it did not have a black tip to the tail and was about 30cms long in total....any ideas out there? Would welcome any comments on this new visitor in the garden. Sure it is a wee weasel now.