OP
invictagunner
Just to keep those following this thread up to date. Last night I sent an email to Power-One and received an immediate automated response with a case ID. This has been followed up by a phone call a few minutes ago and, since the installer has gone out of business, are referring the matter to the Service Manager to decide what to do. For info the installation is covered by warranty insurance underwritten by Guarantee Protection Insurance Ltd. (no idea if this is good or bad news!!!)