Extract from LASORS 2008:
F1.2 REQUIREMENTS FOR THE ADDITION
OF AN SEP (LAND) CLASS RATING
For rating issue you must:-
a. Provide evidence of having completed an approved
course of training in accordance with JAR-FCL for
the purposes of the rating.
b. Pass a class rating skill test (LST) conducted by a
JAR authorised Class Rating Examiner (CRE) or
Flight Examiner (FE).
c. Pass a theoretical knowledge exam (oral as part of
the LST).
The class rating course, including theoretical knowledge
shall be completed within the 6 months preceding the
skill test. Each applicable item of the skill test shall be
satisfactorily completed within the 6 months immediately
preceding the date of receipt of the application for the
rating.
I don't have the detail of what subpara "a" will mean, but the answer to your question seems to be: yes, you can. Perhaps best to get advice from a local club who could provide whatever training is needed.