To mark the release of Fifty Shades of Grey in cinemas this Friday, February 13, we're giving you the chance to win some official #FiftyShades film merchandise.

To be in with a chance of winning, just answer this question:

Who wrote the book Fifty Shades of Grey?

Send your answer, name, address and t-shirt size, marked #FiftyShades Comp, to: tencompetitions@rte.ie. Competition is open to residents of the Republic of Ireland and Northern Ireland only. One competition entry per person. Closing date: Monday February 23. 

Fifty Shades of Grey