Hi there,
Whilst I appreciate your concerns with triggering the alarms in the adits and the resulting call out to somebody from BW, I must add some facts from being one of the members in the dinghy.
With regards to the alarms in the adit, I think a few people have been confused by what BW mean as an "Alarm". Each adit features two PIR sensors, which are linked to and only feeding the emergency lighting system. Thus theres no possibility they could be to trigger an intruder alarm otherwise every time a boat went past them, the alarm would be triggered. There was an alarm point in each adit which consisted of a microphone and loudspeaker, with clear instructions to "Hold the lever down for five seconds, wait for a response from a member of BW staff, then hold the lever up to talk". Clearly we didn't touch this system, as I don't think it would have done us much good.
To attempt to reassure you, I must add - nothing was damaged, touched or tampered throughout the entire journey. Nobody interfered with any of the systems, gates or sensors and we ultimately sailed in through one end and out the other side. There were three life jackets in a black zipper holdall to aid us should we have got into trouble - plus a secondary boat.
Be assured it won't be happening again, and nothing was damaged and nobody was harmed.. It was a well prepared adventure that went without hitch. I do have to laugh at Gaggles quote though, I can understand that OAPs travel through the tunnel on boats, but lets be fair - they don't exactly do the entire tunnel in a dinghy now..!
I have to add, thanks for the ultimately positive reception from the Waterways community.