Thanks for the feedback.
The bike is in a row of bikes and was difficult to access, will drag it out and have a closer look in the next few days.
I am to go back, put the battery on charge and see if we can fire it up. Tried starting it yesterday but the starter just clattered, hopefully just the battery being a bit low.
The background is that it belonged to a close friend who, very sadly, died in an accident while riding one of his old Norton's earlier in the year.
It won't be for a SatNav but I will check for power to it.