correct RT phraseology
Hello!
What is the correct RT phraseology with the word "to"? I know that "to" must be used with FL (either climbing or descending).
"Climb to FL 410"
Has "to" to be omitted with the term altitude? If so, must the term "altitude" be used before the altitude?
"climb (to) altitude 3000"
or
"climb 3000"?
Sorry to post such a banal question, but I haven't flown much in UK airspace recently, and I cannot locate my CAP ... 413 (?).
Thanks