Thanks for the pointer, but I've tried them and they have sold out too. I find it very odd that there are seemingly no spare e-bike parts for this model. It feels like Raleigh only built about a couple of dozen!
I know it doesn't help, but we always warn people off these types of bikes with proprietary systems. This is the problem you get years down the line, when fashions have changed. Best is unlocked systems with standard Chinese parts, next, if you must have a locked systen, is Bosch. After that, it's a lottery. Anything niche is a disaster.
Unfortunately most guys go into an ebike shop to buy an ebike without knowing any of this. They try the bike out. It goes well, so they buy it, then, a few years later, they need a new battery and find out that it costs more than what the bike's worth, or they need a new part that is simply not available. Think about all those poor guys, who succumbed to the Gtech marketing. They got batteries that didn't last long, only to find that there were no spares when they needed one.