I am not sure where I stand on the RID thing. For starters I am not sure every model will be able to fit the module, I could probably get one on a 5 inch quad but there is no way I could get one onto the 3 inch quad, does that mean I can no longer fly the smaller one. I know they are saying we would probably not need it at a bmfa site but we do have an old building near here we occasionally fly at. Similarly a friend of mine flys dlg and having see some pics of his builds where he has had to cut servo lugs off just to get the kit in then there is no way he could fit a module in there. Again not an issue on a club site but he lives in Devon and can fly pretty much anywhere on dartmoor I believe.
Some sort of mobile app that logs your location has been suggested but not every area has a signal - my mate on dartmoor for example. Personally i wonder if we could have a website that allows you to pre-log your intention to fly, ie. log on in the morning to state where and when you will be flying that day. This would eliminate the need for modules or a phone signal and the authorities would still know who was flying where and when - obviously apart from those with bad intentions who are never going to comply with any regs anyway.