[OM] Help - can anyone identify these nests

[SwissPace]

Kerstin has just texted me this image , they are about 2cm (1inch) long 
and our roof bedroom, I thought if anyone would know it would be this 
list collective anyone know what critter(s) made these

<http://thattimeoflife.smugmug.com/Other/OMlist/i-h7P6gCr/A>

Thanks Ian
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