grey wall box roughly 12" by 10",some dark grey lines and 9200 top left cnr...if it is then do you have any pir for said item as i have one that seems faulty,litlte red light perm lit,also control box keeps clicking...?one other thing,do you have a back up battery as this one seems to have no charge......
sounds like a 9200. Any pir will work with it as for the battery it should normally be replaced every 5 years at least. If you dont know of a security wholesaler.Screwfix stock the pirs and alarm batteries
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Try fixfault.com to fix home alarm systems.