Good thread, this. I've just bought the Sealey 1100 unit from Ebay. £160, as opposed to Toolstop's new price of £179. Either is post free. Although I have a seperate power pack for use in my camper (as opposed to a leisure battery and relay system) I tend to use the car's battery also for a few accessories - mostly when I forget to swap to the power pack when I park up. This Sealey unti will be a good emergency stand by.