In a post by @DefenceGeek, retweeted by @hey_itsmyturn, it was reported that two B-1B Lancer bombers are carrying out training flights from RAF Fairford. One aircraft, FROWN30, is currently trackable on Flightradar24. The original tweet read:

More Trackable B-1 Practice Flights #IranWar‌

A pair of B-1B "Lancer" bombers at RAF Fairford (EGVA) are due to carry out training flights today. One is currently visible on @flightradar24:

B-1B "FROWN30" 86-0124 #AE6BFE "Oh! Hardluck II"
B-1B "FROWN31" (TBC)

B-1 Photo via @JetPhotos - Alexis Boidron