Confidence: I'm as sure as I can be.
Notes: Stephen is right, Vespula germanica. Although the abdominal markings help, they aren't reliable enough on their own as id features. On this specimen the yellow marking on the front-side of the thorax is expanded medially, forming a shallow triangular shape, and if seen close-up the bottom edges are ragged. This points to V. germanica. On V. vulgaris (and some other species) these markings are parallel-sided and straight or shallowly tapering smoothly to the front. Beware of some V. germanica specimens don't fit this rule though. In which case other features such as inner mandible shape and facial markings near the antenna have to be checked.