Senator -> Difficult to fit and involved removing oven and replacing bracket fixing bolts with longer ones.
Senator -> Basically straightforward except the wire from the camera that needs to go into the van. You need to drill a hole to pass cable into van and without replacing the fitted connector would have resulted in a large dia hole. Suggest changing connector for one that can be dismantled. I used a Lemo type.
UncleNorm -> DIY installation with much help from Peter, Humber-Traveller. Whilst fitting battery, a permanent 12v supply was added.
Senator -> Most batteries seem to have the clamp plate connections on the ends (as did my original one), but these batteries have them across the sides so they don't match my vehicle. But as they are fairly well contained and will not move this shouldn't be a problem. If ever I replace it again I will get one with the end clamping!
brillopad -> make sure you install it over a wardrobe or cupboard to hide all the wires also you can pick up all the connections from the fridge