Climb clearance while on a SID with an Alt Restriction
 

Revisited just to clarify if altitude restrictions are cancelled.

JammedStab,
In The U.K., when you hear the phraseology...."Climb now, FL XXX", the altitude restrictions are cancelled..........That is, apart from the minimum altitudes, (which you still must cross above the altitudes specified on the SID plate), to ensure you remain vertically within controlled airspace, or separate your a/c from other SIDS below you, originating from adjacent airports.

How about the speed restrictions then? If the altitude restrictions are cancelled, does that cancel the speed restrictions too?

Thank you sir,

And for outside the U.K.?

Zonoma,
I can only speak from my own experience, but the speed restrictions were expected to be complied with unless we specified 'No ATC speed restriction'. That instruction was in our MATS Pt.2 from 1979 until 2011, (and is probably still there).
Most of our SIDSs, (and those from other airfields into our unit's area of responsibility), had the standard 250kts or less below FL100 restriction on the plate, designed to preserve initial spacing between outbounds but, several SIDs, (and, I think it was 5 of them), also had a 'speed profile' built in which was effective to much higher levels. This was designed to ensure the a/c climbed above London TC airspace and was usually cancelled once the traffic was working the Daventry Sector, provided a/c were above FL195 around Honiley.
If anyone has not encountered a 'speed profile', I've just checked the current plates on the NATS IAIP site, and the procedures are still in place on LISTO (both directions) and SANBA SIDS out of EGCC.

Zonoma, why would you expect speed restrictions to be cancelled as a result of an amended clearance regarding a climb??

Whilst "climb now" is the current UK solution to this problem, ICAO have been working on an 'international' solution which will be implemented alongside the 2016 edition of PANS-ATM.

It used to be that if you were below FL100 within the London TMA you flew at 250kts unless ATC said otherwise. Now aircraft fly 250kts until the end of the SID regardless of level, so I asked as if the new issued altitude cancelled the SID levels, could the SID therefore be considered completely cancelled and then aircraft fly whatever speed they wanted.

There is a minor "in house" issue here hence why I asked.

Ah okay. AFAIK, the 250 below 10 rule has been decoupled from SIDs and exists throughout UK airspace as a means to improve a pilot's ability to see and avoid.

In the interests of covering everyone in the entire world from any kind of blame for anything whatsoever, how about "Speedbird123 climb now, unrestricted, open climb, SID altitude restrictions cancelled, flight level 120.":ugh::ugh::ugh::ugh::ugh: