Although Fred Blake (Gordon Jackson) is flight crew on a Short Stirling (the type of aircraft Celia makes parts for and which is seen being towed out of the factory), there are at least two shots of Fred's aircraft taking off/climbing which are actually an Avro Lancaster.
When Fred and Celia try at first to enter the country pub there is a large Canadian soldier standing inside near the door, but when they finally do enter with the camera now filming from inside the pub the soldier blocking their way is no longer there.