"Peter" wrote in message
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Separation between each other, or separation between IFR traffic and
VFR traffic?


In all cases, as far as separation goes, aircraft operating VFR-on-top are
treated as VFR aircraft.

In Class D and E airspace VFR aircraft are provided no separation, nor are
aircraft operating VFR-on-top.

In Class C airspace VFR aircraft are separated from IFR aircraft, and
VFR-on-top aircraft are separated from IFR aircraft. Neither is separated
from other VFR or VFR-on-top aircraft.

In Class B airspace all aircraft are separated.