Wilkinson pickups were the first designed for Trevor Wilkinson's "Fret-King" range of guitars. All these instruments are based on classic designs so that required pickups reflecting the character of the original that inspired the new concepts.
As with the original guitars, the pickups that featured on these underwent many changes over the years, it could be said not always for the better.
As major manufacturers maximized profits, less time was spent on quality control as the emphasis moved to quantity! Many changes in materials and manufacturing techniques were made with no consideration for the effect on the character of the pickup.