(1) Any instrument expressed to be supplemental to a previous instrument, or directed to be read as an annex to such an instrument, is, so far as is appropriate, to be read and has effect as if the instrument so expressed or directed -
(a) were made by way of endorsement on the previous instrument, or
(b) contained a full recital of the previous instrument.
(2) This section does not confer on a purchaser any right to an abstract, copy or production of any such previous instrument and a purchaser may accept the same evidence that the previous instrument does not affect the title as if it had merely been mentioned in the supplemental instrument.