Originally Posted by
SidHolding
It’s my understanding that any clearance issued by ATC in the U.K. supersedes any previous clearance, unless it is reiterated. The use of “climb now” is to emphasise this on a SID as it is non ICAO and aids understanding for non U.K. based pilots.
Yes, and I personally find it more useful and straightforward than the ICAO "LEVEL RESTRICTION(S) (SID designator) CANCELLED".