Right, I throw my stupidity on to URKM to do as it will. Have purchased 12V socket - no problems there. Several suggestions of putting in an inline fuse on the + lead (as cutting off the end removes the inbuilt one). The questions I have are what amp fuse to put in the holder and also what type? The bike's standard fuse type is a blade type - but Maplin don't seem to sell inline connectors for those - only the cylinder type. The GPS power unit uses a 1A fuse, the socket I got earlier comes standard with a 5A fuse. Do I get a 5A one or do I get a 1A one (which they had in stock but couldn't find allegedly) to wire in the socket?