Nice looking bike Pete. A good base project to start from. I don't think the front mudguard is a Rickman item as they didn't have all the bracing, they are attached to the forks using jubilee clips on mine, there are no mechanical fixing points on the Betor forks.
Same bar end mirror as mine!
Don't forget to make a weekly appointment with a chiropractor when you get it on the road 😉.