It seems EVERYONE panicky and posting irrelevant information about cancelling and rebooking etc in this thread has failed to read the LAST sentence of the letter!! It is an auto generic biometric request response!!If you have already booked or attended an appointment to enrol your biometrics before seeing this email, then please ignore this reminder.
If there really was an issue with your biometrics, the letter or notification you received will be far more personal and explain.