There have been up to five US Navy P-8s at Prestwick, and another five from a different USN squadron at Lossiemouth (as well as our four P-8s) daily for the last few weeks. At least one appears to be airborne at any one time, and operations are out over the North Atlantic. Presume the Ruskies are being particularly active at the moment?
Nice Lossie image from Niall Peterson here: