Will drive for miles without problem. When it becomes noisy, it can be quite loud. Pedestrians turn to see where noise comes from. Could it be a ball joint on steering? or wheel bearing? Is it safe to drive to nearest Vauxhall garage? It's at a friend's house in Plymouth now
Could be brake pads or your other suggestions , though you would think it would show up in steering when driving apart from noise . Some males of disc pads have " screamers " that do as the name suggests when pads get worn to a certain limit to let you know they need replacing . For peace of mind , jack up and check no excessive play at wheels before taking to garage . You could take it to a good local , independent garage for checking and repair rather than VX dealership and probably save a fair bit on cost if just a run of the mill repair .