"I had a bit of a dig around the net and couldn't find any charge leads with that little white connector that the JR TX batteries use so is there some way of making up my own lead if I have to?"

most remote/cordless phones have that white connector, anywhere that sells those phones and or batteries commonly have them in a scrap bin if you ask for them, the only thing you have to do is cut them off close to the battery and observe polarity when you connect them up. i use a little dab of solder and cover with heat shrink tube, works fine, i have made four packs lately for friends with JR radios .
hope it helps.