For clarification, the UK rules (MATS Pt 1) are:
Rules of the Air require aircraft flying below FLIGHT LEVEL 100 (not AGL or AMSL) to observe, with exceptions, a speed limit of 25kts IAS.
<blah, blah>
The 250kt speed limit does NOT apply to:
a) flights in Class A and B
b) IFR flights in Class C
c) flights in Class C & D when authorised by an ATC unit
d) test flights in accordance with specified conditions
e) aircraft taking part in flying displays when authorised by the Authority
f) aircraft subject to written permission granted by the Authority
g) aircraft not subject to the ANO (ie military)
There is some more stuff but the bones are above.
Just for thought from the postings previously - the phrase "no ATC speed restriction" has been mentioned a few times - is this the same or different to "high speed approved" ? To my mind, the latter approves 250kts+, the former does not. As I said, just a thought...
The Lizard
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Just do the dance and become a lizard...