FYI there is a CAA pamphlet detailing the regulatory approach to this issue (just google it to find the actual number). It also contains a host of useful contact numbers depending on how keen you are to get further information. You could also contact SRG at Gatwick and ask them how many ASR's have been filed on this topic (not many!) - they may even be able to tell you how many instances have occurred at LBA.
Hope this helps