Any works done recently?
It could well be the bell, but stabbing in the dark isnt going to help you is it!
As before TRACE the fault. Isolate all until you find it.
At a guess Dave its probably your bell box tamper, and before no it probably hasnt been tampered with, but does contain components that will fail over time because it is outside and subject to all weather conditions.
Give me a call and i will tell you how to isolate it from the system.
Trace & repair the tamper fault
I can answer this question...
Tamper Light on Securit 700L Plus Alarm?
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