ah - yes. We've discussed this one. Happily the present system is perfect.Dell, have you ever considered using walkie-talkies to keep the lead rider in touch with the lanterne rouge? We sometimes use them on MTB rides and they're pretty useful if somebody punctures, especially at night. They have a range of a couple of kms. They come with a clip that's the same as a Nokia phone belt clip so you can attach them to a shoulder strap, then it's simple to squeeze the PTT button and talk. Any number can be operated on the same frequency. I'm hoping to absent myself from the office "do" on Friday evening as it's a few yards from the town hall and I can nip over and see you all off so I could bring them along if you wanted to try them.