She was given a tour of the grounds she loved when the house in Buckinghamshire was her official country residence during her 11 years as Prime Minister.
Mr Brown is believed to have issued the invitation after Lady Thatcher asked him how the gardens had changed since her last visit in 1995.
Iron lady: Baroness Thatcher leaves Chequers after lunch with the PM
It follows her controversial invitation to Downing Street last year.
Last month, Lady Thatcher’s daughter Carol spoke for the first time about her mother’s fight against dementia.
Hulk to Chelsea is '90 per cent done'
TV Baftas - in pictures
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Locked up and banned: The Tube drunk whose vile racist rant was caught on film (video)
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British housewife facing FIRING SQUAD over Bali drugs smuggling charge was 'neighbour from hell' -
London 2012 Olympics: Raising the bar and the Games haven't even started yet. Price of toasting Team GB is £6 a pint! -
Video: Intruder bursts into Leveson Inquiry to brand Tony Blair a war criminal -
Ken Clarke: Tories demanding EU poll are extreme nationalists
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First victory for campaign to save famous pie and mash shop -
'Normal' clothes inspire new designer at Central Saint Martins fashion show -
Usain Bolt is quick to tell fans he’ll be lightning fast again -
Invasion of the book snatchers: Brent Council sneaks into Kensal Rise library at 2am to strip it bare -
Video: Is this the World's most OTT marriage proposal? Hilarious film
The O2
Check out the cool stuff happening under our tent such as the hottest gigs, comedy, sport, films, clubs, bars, restaurants and much more.
A home to be proud of with Halifax
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Playing a game-changing role during the Games
Cisco is providing the solutions for London 2012's complex IT needs.
Win a Silverstone track day with Zantac 75
Feel the burn of a different kind - 20 Silverstone motoring experiences to be won
Celebrate with MARTINI®
This weekend toast one royal with another and make your Jubilee sparkle with a MARTINI Royale.
Glamour Awards
Garden party
First review
Fair-weather goths
Diamond Jubilee
Dog save the Queen
A better ex than husband
Best of the Baftas
You big softie
Gay marriage
