Hi Clive1, and a warm welcome to the forum, though I'm sorry you have to be here. ED is very common after treatment and can often take a couple of years for things to get back to "normal", It is very important for you/partner to keep stimulating your penis, this is key in eventually getting the blood flowing again, and intimacy can still be very enjoyable for you both without intercourse, like you my partner is amazing and helped me through my issues, 

Eddie