COUNTY DURHAM.- One of the treasures of The Bowes Museums sequence of period room panelling will be highlighted as the Object of the Month for August. Every Thursday at 2.30 curator Howard Coutts will reveal the story behind a segment of panelling from a London townhouse built for Philip Dormer Stanhope, 4th Earl of Chesterfield. Chesterfield, best known for his letters to his [illegitimate] son, giving advice on how to behave and get on in society, was also an international diplomat who desired a house fully up-to-date in style. His house was the first in England to show the ornate rococo style imported from France in the mid 18th Century. Dr Coutts, who will talk about the house and about polite society in London during that period, said: There is much sense in Chesterfields letters, but also much calculation on creating the best impression on ones social superiors. Chesterfi