I hope that you have more luck than I did when I worked at Swanwick. A couple of flying club members who were also A320 airline pilots based at LHR asked me if it might be possible to visit Swanwick in their capacity as airline pilots. I was overwhelmed by the lack of enthusiasm by watch management and other departments to their visit. The only way it would be possible for them to visit Swanwick was that I would have to take a days leave and show them around myself. Needless to say their liaision visit never happened.