THese Lafree chargers made by Panasonic have often been troublesome and there's a newer charger model now which you can get from through Giant Bicycles dealers. They are expensive though. To find a dealer for your area, go to this
Giant Dealer finder webpage, enter your location, then click the "Hybrid" box on the right. That will give you the nearest Giant e-bike dealer who can order for you. Stocks are held in Europe so no waiting for supplies from the Far East.
An alternative with the right sensor characteristics can be bought from the USA which can work out cheaper, but that depends on whether you get caught for import duties, VAT etc which then parcel enters the UK. All the details to get one of these are on my Panasonic support website
on this link.