Andy, you will require a skills test. You clearly state your reval has run out. This happened to me a few years ago. My IMC, and SEP reval, ran out of sync. Despite me having my IMC test, which should have covered me for my 1hour instructor flight, which would have then signed off the SEP, the IMC instructor did not sign my SEP review.
I asked if they would sign retrospectively. No was the answer. I required a one hour check ride in a club 172, which was then also charged as a skills test, which then allowed me to fly the club 172, and my SEP was duly signed.
Whole escapade cost me 500.00 quid. I was not that happy.