Man, Reno keys are f**king sh*t, my first set about a year ago both normal and spare keys went wrong and wouldn’t start my car, had the same problem as you Dazz, I had to get them both replaced and luckily it was under warranty.
Now a year on no more warranty and one of mine has f**ked up again, I was stuck in Bluewater car park for about 15 mins trying to start the car, every time I turned the key the immobilizer light just flashed like crazy. After the 100th attempt it started!!!
At the moment I’m using the spare which is working fine, buit for how long.........