I got my alarm from Phil (philmgf), but am ashamed to say I haven't got round to fitting it yet as I promised him an in-depth How To when I did. I was holding off until I did the service, so I could refill and bleed the coolant in the process.
Might be some useful information in his thread below
I have the B&G low coolant alarm now and it's a great piece of kit, fitting instructions and photos are in the .pdf below, it's about an hours work once the engine hatch is off.
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