Hi Richard, the NOCO has built in safety devices to stop incorrect connections etc. Check it out on the Halfords web site.
Thanks, safety devices sound good, as I have a new battery to replace the 10 year old one which has now failed. The short cranking duration would not have been helpful at the time of failure, so it was fortunate I had a spare battery with me to overcome what turned out to be my coil isolator switch in the 'off' position, in addition to the battery. Anyhow I see new offering from Lidl is available at £44.99. Richard