despegue
Correct is not.
When you are flying in UK airspace it is correct protocol to use the word "degrees" at the end of a heading that ends with a zero for the reasons given above.
1985 - it's not just a NATS thing but a rule developed by the authority for pilots and controllers overall. However, it's well known that NATS promote the use of "degrees" with every heading, which is not strictly standard but enhances safety nonetheless.