In London ACC between one sector and the next the DCTs will be known as the kit will be updated from our inputs. These are sometimes standard DCTs so therefore don't need coordinating and other times they'll be done on a one off basis so will be done verbally. I will give two DCT fixes if I need to, most though are far enough to only need one. Cross border DCTs work the same, we have pre coordinated DCTs that we can send to, especially with Maastricht, and other times we coordinate verbally. Difference is our inputs don't get transferred to the next ACC so they won't know exactly where you are going until you tell them. I'd never give two DCT fixes cross border as I have no idea how it effects the next ACC. I expect an aircraft on first contact to tell me which point they are routing to, it enables me to ensure you're doing what I expect and I can then issue further routing to check we both have the same information for which route you are flying. Until we get some sort of download from the aircraft so we can check then we'll have to keep doing it.