A postcard written on board the fateful Titanic liner is estimated to sell for £20,000 when it goes for auction tomorrow (18 July).

The postcard features an image of the ship, which sank after hitting an iceberg on its maiden voyage across the Atlantic Ocean, on 15 April 1912.

It was originally posted on board the Titanic, and is addressed to a Miss Green of Birmingham.

It reads, "I wish you were here, it is a lovely boat & it would do you good. Am just going on deck."

It's then signed "Fisgig" - the nickname of the sender, Sarah Daniels, who survived the disaster in which around 1,500 others died, just days after she writing the postcard.

The card also bares the circular datestamp of 11 April 1912, of Queenstown (now Cobh), Ireland, the port from which mail written on board was posted.

Sarah Daniels was on the liner traveling as a maid to the wealthy Allison family. When the iceberg was struck, she went up to investigate. But she was unable to convince the Allison family that there was any danger, and so she was directed to a lifeboat by crew members.

Both parents in the Allison family died, as did their daughter. Their baby son did survive however, saved by his nursemaid.

The postcard will be sold at Auctioneers Warwick and Warwick.