IO540 is quite correct.
Remember, PFA permit aircraft have to be flown VFR at all times. An IMCR changes the VFR rules, so you have a much more flexible system. Having said this, the "below 3000 ft rule" allows huge latitude provided your aircraft is appropriately equipped and you are competent. This is one of the reasons why it is possible to tour seriously in a permit aircraft, without actually braking the NO IFR rule.
My aircraft cruses at 138kn (odd that
) so I tend to forget the speed limit.
Rod1