Anything built after May, 1964 and number 26705 is a phase 2. In March, 1965 the phase 2's went to separate indicator lights from running lights for the front and back and the rear reflectors went on the bumper.
If yours was built in Jan., 1965, it is an early phase 2, but with combined running light/indicator lights both front and rear.
The first Mk III or BJ8's were built in Oct., 1963.
Other differences in the phase 1 and 2; the phase 1's had glass lenses for the indicator lights, 2's have plastic, and the phase 1 had a cubby box as part of the arm rest ( a very neat feature that they should have kept for the phase 2's.