Looks like your SEP rating has most likely expired by more than 5 years, in which case it will have to go back to Gatwick for re-issue; less than 5 years and the examiner can do it. If you are in Auz that could be more of a problem.
Western Australia Aviation College at Jandakot should be able to help you re JAA qualified examiners.
WA Aviation College You will have to do a Skill Test lasting about an hour: Airfield departure two steep turns, two stalls; UP recovery; PFL; short navigation leg at examiners discretion; back to the airfield for 3 circuits. As per:
http://www.caa.co.uk/docs/33/FORSRG1157.pdf