Ok now that was harder than it should have been. The front callipers are now apart thanks to a couple of weeks “soaking” in WD40, an air compressor and a clever use of a pair of pliers and a rubber mallet.
I will be ordering new brake lines for the bike and a kit for the rear master cylinder. Once cleaned and reassembled the next phase will be re-oiling the front forks and new tires. The motor I am looking at has nearly completed it’s testing and I am working through some ideas for battery packs.