In my opinion H. Westons & Sons Ltd. Stowford Press Low Alcohol Apple Cider at 0.5% is the best cider I have tried which actually tastes like the original. With only 29 calories it is also good for the waist for 330ml bottle.
If you prefer a more pear flavour then try Thatchers Zero 0.0% Alcohol Free Cider (Alc no more than 0.05% vol.) at 130 calories in a 500ml bottle.
Sainsbury's Medium Dry Low Alcohol Apple Cider (500ml, 150 calories, Als 1.0% vol.) is also would a try but I found it a little sweet for me.
Another option and my least favourite was Morrisons Low Alcohol Cider (500ml, 150 calories, Alc 1.0% vol.) and another sweeter version.