Suggestions for a Small rack mixer as a backup

[robbocurry]

I originally purchased these http://gridconnect.com/industrial-wireless/bluetooth-serial/bluetooth-serial-port.html  several years ago, but this outfit http://www.usconverters.com/serial-rs232-bluetooth-adapter    has similar units for a lot less. Maybe you can find someone in the UK that carries or even makes this.

Thanks, I'll check them out