OK but what do you mean by visibile, and more importantly what do the regs say - a tundish would be visible in the attic, cupboard, or under the stairs if you took a look ... would that do? After all I wasn't planning to hide it ... Perhpas the best bet is to add an audio alarm as already mentioned.
If the ballcock failed, I think you'd hear it in the attic anyway, and in the worst case scenario, I'd certainly notice a reduction in pressure elsewhere, and the attic is used freqeuntly ... there must be a definitive answer wherher a tundish is acceptable in the attic wihtout an audio alarm.
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