Hi Paul Welcome to the clan. I suggest you visit one of the two London section club nights and meet a few members. You will find a warm welcome and all the info you want. There is a bit to learn, but not enough to be apprehensive about. Some of us, having mainly owners from remote locations in mind, have tried to put some open access info on the web. The following link might be helpful
Other info on our website.
I only had one bike with Dowty forks and I fitted a set of Norton Roadholders and Norton front brake, but than, back in those days nobody thought that doing a special was sacrilege. Best listen to those who know on this subject. Kindest Regards Roger