The UK (EGTT and EGPX FIRs) Sector File project is an open source collaborative project to provide the highest quality sector file to VATSIM UK controllers.
A new sector file will be released in line with each AIRAC cycle (as long as significant changes warrant such as release).
If you wish to contribute, take a look at our contribution guide. The Wiki (a work in progress) also contains more in-depth information about the contents of the sector file.
Note: past AIRAC amendments are stored here.