Would seem that they are at least tolerated until users stream live images to the web. A number of people seem to have acquired them around Christmas, and were streaming them by January. However all the UK-based ones have rapidly disappeared, seemingly due to Ofcom warning them off. NL-based ones are still functioning though (of the ones I know about). Interesting to watch (for a short time!) but it immediately becomes apparent that either not all aircraft are using s-mode, or the receivers in use aren't picking up everything. No doubt a combination of both, but I believe that as it relies on line of sight then having your aerial in a ground floor flat won't produce the quality of results that access to your own church tower in the country might!