F-15's Over Leicestershire

I’m at uni at Loughborough and for the past few days I’ve been seeing a few F-15’s flying around, I’ve not seen this many since I’ve been here, anyone know why?? Today I saw a nice close 4 ship, yesterday a two ship, and a couple of days before that a singleton. They’re all flying due East somewhere, probably to Lakenheath or something like that!