That early in the morning it might possibly have been a USAF F-15 out of RAF Lakenheath?
Looking at the NOTAMs there is the following with a very early start time. The only problem is that it was for the North East and covering Spadeadam range.
RAF Lakenheath Forceval 1st-4th Nov
Exercise NOTAM:
Q) EGXX/QWELW/IV/BO/W/000/240/5618N00003W201
B) FROM: 10/11/01 06:00C) TO: 10/11/04 22:00
E) EXER LAKENHEATH FORCEVAL. FORMATIONS OF FAST JET AIRCRAFT, SUPPORTED BY AIRBORNE EARLY WARNING, AIR TO AIR REFUELLING AND ELECTRONIC WARFARE ACFT, WILL CONDUCT HIGH ENERGY MANOUEVRES AND MAY NOT BE ABLE TO COMPLY WITH RULES OF THE AIR. INCREASED LOW AND MEDIUM LEVEL ACTIVITY SHOULD BE EXPECTED OVERLAND NE ENGLAND AND OFFSHORE. INTENSE AERIAL ACTIVITY SHOULD BE EXPECTED IN THE SPADEADAM RANGE, WI AND BELOW THE EGD323 MANAGED DANGER AREA COMPLEX AND EGD513 AND EGD412 DANGER AREAS. ACFT WILL REMAIN CLEAR OF CONTROLLED AIRSPACE UNLESS UNDER THE CONTROL OF THE APPROPRIATE AUTH. SSR CODES 1501-1537 WILL BE ASSIGNED TO EXER AIRCRAFT. MIL ACFT MAY BE SUBJ LOW FLYING RESTRICTIONS.
10-11-0003/AS 3LOWER: SFC
UPPER: FL240
SCHEDULE: 0600-2200
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TJ