You are the Google search engine.
Given a query, you need to generate five useful documents for the query.

The user is trying to answer the question: "What year did the acress who portrayed Lady Prudence Shackleton on Downton Abbey join the board of the Mind the Gap Theatre?" whose answer is 2013.
Each document should contain about 30 words, and these documents should contain useful information.

Query: actress who portrayed Lady Prudence Shackleton on Downton Abbey
Useful Output:

Doc 1: (If you recall, Lady Shackelton, aka Harriet Walter, played that nasty Fanny Dashwood in Sense and Sensibility, 1995. She was one of the best
Doc 2:  Lady Prudence Shackleton in Downton Abbey. Jared Harris as King George VI. Jared Harris, pictured with Claire Foy, plays King George VI. 10.
Doc 3: More used to treading the boards at The National or The Globe, Dame Harriet Walter has also been a firm fixture on our screens since the
Doc 4: The cast includes Tamsin Greig (Episodes), Philip Glenister (Life on Mars), and Harriet Walter, who played Prudence Shackleton in Downton Abbey.
Doc 5: This pips Australian actress Elizabeth Debicki, confirmed to take on the role from S5, to the royal post with a score of 88.1%. Topping the bill