Well done and very nice bike for under 2000 miles and less than £700. My experience is of two Raleigh Motus bikes with Bosch motors, my own and Mrs EV's. Your bike was probably made in the same Accell factory in Hungary; the label is usually visible at the back of the motor or the downtube. Mine is 2nd hand in lovely nick with under 1000 miles when I bought it at 18 months, and I've added coming up to 2000 miles in just over two years. It's a 400 battery which I try and charge at two bars but before it drops to one bar, and charging it to 5 bars though not usually to completely full - when the software and charger are programmed to stop anyway.
Norfolk is pretty flat of course but the display on 5 bars after a complete charge still always shows between 100 and 110 miles for Eco. I've often wondered if the software learns the rider's riding style, and how much it is ridden above the 15.5 mph, but about 110 is what Bosch claimed for a new 400 battery. I had the software updated by a dealer when I got It, and the printout shows that the ECU does know exactly what percentage of riding is done at each level. My wife's 500 battery has a claimed 140 miles at new. Out of interest I've twice deliberately discharged to empty so I could see how far I got...and got just over 100 both times. I find that the bar display is pretty accurate as to how much battery has been used, and it takes a surprisingly long time before it drops to 4 bars. However, and as expected, 2 bars and 1 bar do not represent the same distance available as obtained from the 4th or 5th bar.
Enjoy it.