It will be interesting to see what equipment LBA selects when the time finally comes to replace the Watchman primary. The processing equipment was upgraded about three years ago with 4G-proofing done before that so this may not be any time soon. The Watchman has proved to have considerable longevity at LBA - been in service for just shy of thirty years and has long outlived its ACR430 predecessor. I wonder if LBA will this time buy their own SSR aerial or continue the supply arrangement with NATS.