As Speedbird says , is this a club rule ? or just a misundertanding on someone part as its not a BMFA requirement
Having passed the 'A' test in October with an Electric powered model I would'nt be too happy to have to take it again for IC!
From the BMFA achievement scheme Pdf on BMFA website
http://www.bmfa.org/Info/RCAchievementScheme/StandardsGuidelines/tabid/244/Default.aspx?EntryId=135
"The test can be performed with virtually any powered fixed wing model, i/c or electric"