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@Fox
They have just emailed me back to say this is the one I have ordered for £19.99 - weird it is elsewhere on the site for that price!
http://www.mandp.co.uk/productinfo/547798/Security/Alarmed-Locks/Xena/XR1-Disc-Lock-Alarm
110Db and a 7mm gap height - so do we think this will work? I'm guessing yes if the other one is 7.5mm and will fit two chainrings (I only need it to fit one).