Why Guildhall Art Gallery and Roman Amphitheatre deserves a Toast Award

What major London gallery contains the second largest oil painting in the country, pre-Raphaelite masterpieces, mystery paintings, biting political art and an ancient Roman building in the basement?  This is The Guildhall Art Gallery, the City’s hidden gem, designed to be “a Collection of Art Treasures worthy of the capital city” when it was built…