Provided that the SEP Class Rating is currently valid:
The training flight may be replaced by any other aeroplane proficiency check or skill test for an instrument, class or type rating (as defined by JAR-FCL) with a JAA qualified Examiner, or by a flight test for the issue/revalidation or renewal of a UK IMC rating.
(See LASORS F1.4)
Note that this has to have been a JAR-FCL IR!