Martyn Carey 
Other Heroes 

When an inept robber steals a single magical ceramic from a stately home, a disparate group of wizards are reluctantly drafted in to investigate. When their search for an item takes them to Holy Island and Newcastle one of the team is nearly killed. 

Then they locate more of the magical ceramics, this time in London, but the person holding them is murdered in the cells of a police station, and nobody can work out how. So they have to battle a lack of information, pressure from the police to quit and an increasingly deadly threat to find where the stolen item has gone, who took it and, most importantly, why…

This is the second book in the Ordinary Wizards series.