I have the same jepp logbook. I didnt bother starting it with the totals from my previous logbook already added. No need to. Just start a new running total if thats easiest for you. If you ever have to submit your logbook hours to CAA i.e. for ATPL issue then all you need to do is submit both books. Your total hours etc will be filled in on the application form. If they need to rake through your logbooks to cross check then thats up to them. If you want to start it with the totals already added, then nothing wrong with that either, its entirely up to you!
It is only a legal requirment to record your flying hours. It doesnt say any where that you must start a new book with the hours totalled from previous.