Thanks all got an up date from this end. Have now spoken to a supplier of the quick release ones he said they have been going well but did not think they were right for me due to starting load with my engine. So I have gone with an old style clamp for now. There should be a heavy duty one out at some time so will keep an eye out for that as it would be better to remove the battery and keep topped up more and saves leads running round the garden.
Remember It is only possible to live happy-ever-after on a day-to-day basis