As you say, the EAPC revision doesn't state anything about throttles, but it's not just Clare Perry's word we need depend on. The IVS (International Vehicle Standards) division of the DfT have made the ruling that an e-bike with a fully acting throttle will be treated as an EAPC if it is type approved and conforms in all other respects to the EAPC regulations.
Looking into that, at present type approval is impractical since the Low Powered Moped method that's in force is too harsh in it's requirements. The new L1e-A type approval that will be available after 31st December 2016 has much reduced requirements, in many things only requiring that the e-bike meets existing bicycle standards. Any good e-bike should pass L1e-A type approval without problems.
Of course the IVS ruling is a UK one which I doubt can apply elsewhere in Europe, but since they specify EAPC, that's not a problem. The EU calls them EPACs in it's laws, so the UK IVS ruling doesn't offend. Clever.
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