The setup in question has been updated to the new bridge and the license code was redeemed then, but against a RPi B+.
It has been working well for the last 6 months in that configuration.
We now want to update the setup to a RPi 2 so that Mode S / C and chatty functionality becomes available.
My understanding is it will need a new license as the RPi's mac address is going to change.
The license page at
http://pilotaware.lode.co.uk seems to cover a bridge purchase or a system purchase.
Our circumstance seems to not be covered. I guess it's more like a renewal, which nobody is doing yet.
I hope that clarifies things...
Regards,
Rob