No chance Javelin, if that were the case then we'll need an RP every 5 miles along every airway/UAR, as there are times we adapt or introduce a level restriction due to other situations than just everyday normal flows of traffic. Anyone into LGW from AKIKI may have been subject to a FL180 lvl/below by KATHY. Its not a standing agreement, just ensuring that when the turn at KATHY is taken toward GWC that the a/c is below those into Stansted via AVANT. Not every ATCO uses it, and those that do choose their times to use it.
On the other hand, the last one I know that was introduced was ARTEP to replace the Paris inbounds being cleared to be level 20 nms before Dieppe (DPE), unfortunately our wonderful comms coupled with our Toys'R'Us headsets and the English communications barrier meant that we were repeating nearly every transmission to clarify the point for about a week, as ARTEP sounded far too similar to Dieppe across the airwaves. After a week, every controller reverted to using 20 nms before Dieppe
