Well, the CAA call it a Proficiency Check. See AIC 23/2000 White 10, 6th April 2000
<A HREF="http://www.ais.org.uk/Uk_aip/pdf/aic/4W010.pdf" TARGET="_blank">http://www.ais.org.uk/Uk_aip/pdf/aic/4W010.pdf</A>
I've no argument with what Noggin describes as content. My problem is with the phrase from Avenger, "a COMPLETE skills test" (my emphasis) for an SEP rating expired less than 5 years. If you go to a club and ask for that, you will indeed get your SEP rating back. If you go armed with AIC 23/2000 and ask for a proficiency check you will also get your SEP rating back. The big difference will be the size of the cheque you write after the flight.