I think that you have four years from the date of your last sim check. So if your sim check was April 2011, then you have 3 years from date of expiry, april 2012, which would give a cut off of 2015 to get it on your easa licence wit a 320. Correct me if I'm wrong.
I am as confused by these 'changes' as anybody, but I just had a read of CAP 804. It says:
FCL.740 Validity and renewal of class and type ratings
(a) The period of validity of class and type ratings shall be 1 year, except for single-pilot single-engine class ratings, for which the period of validity shall be 2 years,
unless otherwise determined by the operational suitability data, established in
accordance with Part-21.
May 2012
CAP 804 Part I Flight Crew Licensing: Mandatory Requirements, Policy and Guidance
Section 4 Part H, Subpart 1 Page 6
(b)Renewal. If a class or type rating has expired, the applicant shall:
(1) take refresher training at an ATO, when necessary to reach the level of
proficiency necessary to safely operate the relevant class or type of
aeroplane; and
(2) pass a proficiency check in accordance with Appendix 9 to Part-FCL.
No mention of any time limit. The UK CAA seems to have distilled the AMC into simply 'sufficient skill level need to pass the check'. Perhaps somebody can confirm or clarify?