Text messages between David Cameron and Rebekah Brooks revealed

David Cameron's relationship with former News International boss Rebekah Brooks has come under further scrutiny, after previously unseen text messages between the pair were published.

In one message obtained by the Mail on Sunday, the Prime Minister thanked Mrs Brooks for letting him ride one of her horses, he joked: "fast, unpredictable and hard to control but fun".

In another, the former journalist - who faces trial in connection with the phone hacking scandal - praised Mr Cameron's speech to the Conservative party conference, saying: "I cried twice".

The messages are apparently part of a cache of texts and emails handed to Lord Justice Leveson's media standards inquiry. Few have been made public, leading to accusations from Labour that they are being covered up.

The leak of these text messages again puts the spotlight on Mr Cameron's relationship with Mrs Brooks.

The former News International boss told the Leveson Inquiry earlier this year that the Prime Minister signed some of his missives to her 'LOL' - mistakenly thinking it meant 'Lots of Love' rather than 'Laugh Out Loud'.

Mrs Brooks and her racehorse trainer husband Charlie - who attended Eton with the Prime Minister - live near the Camerons in Oxfordshire.

Both of the messages disclosed by the newspaper were sent in October 2009, shortly after Mrs Brooks left her job as editor of The Sun and became chief executive of News International, which owns the paper.

In one, Mr Cameron wrote:

After his conference speech, Mrs Brooks texted:

A Downing Street spokesman said: "The Prime Minister has always been happy to comply with whatever Lord Justice Leveson has asked of him."