1. This competition is promoted by HarperCollins Publishers Limited (“HarperCollins”), 1 London Bridge Street, London, SE1 9FG.
2. This promotion is open to all UK residents except employees of HarperCollins (or their parent, subsidiaries or any affiliated companies) and their immediate families, who are not allowed to enter the competition.
3. You must be 18 to enter this competition. If you are under 18 you must have permission from your parent or guardian.
4. How to enter: answer the question by adding a comment underneath the post, or tweeting @KillerReads
5. You must include the username @KillerReads and the hashtag #AColderWar in your  tweets or your entry will be invalid.
6. The opening date for entries is 23/03/2015. The closing date for entries is 5:30pm each day. No entries received after this date will be accepted.
7. No purchase necessary.
8. Only one entry allowed per household. If you try and enter more than once by a) using multiple Twitter accounts or b) tweeting the same entry more than once within a 24 hour period then all of your entries will be invalid.
9. The prize is:
Day 1: x1 set of signed copies of Charles Cumming’s back list (A Colder War, A Foreign Country, Typhoon, The Hidden Man, The Trinity Six, A Spy By Nature, The Spanish Game)
Day 2: x1 set of signed copies of A Colder War & A Foreign Country, plus a keyring with camera and recording device
Day 3: x1 set of signed copies of A Colder War & A Foreign Country plus x2 tickets to Bletchley Park
Day 4: x1 set of signed copies of A Colder War & A Foreign Country plus a mini camera
Day 5: x1 iPad
10. The prizes are non-refundable, non-transferable and subject to availability. No guarantee is given as to the quality of the prize.
11. No cash or prize alternatives are available.
12. HarperCollins reserve the right in their reasonable discretion to substitute any prize with a prize of equal or greater value.
13. The winner of the competition will be drawn at random each day from all correct entries on Facebook and Twitter by an independent adjudicator and notified by social media no later than 30/03/2015.
14. The prizes will be delivered to the winners by 23/04/2015
15. Any application containing incorrect, false or unreadable information will be rejected. Any applications made on behalf of or for another person or multiple entries will not be included in the competition.
16. HarperCollins’ decision as to who has won the competition shall be final.
17. To obtain details of the prize winner after the closing date, please write to Fiction Marketing, HarperCollins Publishers, 1 London Bridge Street, London, SE1 9FG.
18. The entry instructions are part of the Terms and Conditions for this competition.
19. By entering the competition you are agreeing to accept these Terms and Conditions. Any breach of these Terms and Conditions by you will mean that your entry will not be valid, and you will not be allowed to enter this competition.
20. By entering this competition you are agreeing that, if you win, your name and entry may be a) used for the purpose of announcing the winner and/or distributed to individuals who request details of the winner and/or b) in any related publicity by HarperCollins, without additional payment or permission.
21. Any personal information you give us will be used solely for this competition and will not be passed on to any other parties without your agreement. HarperCollins’ privacy policy can be found at: http://www.harpercollins.co.uk/legal/Pages/privacy-policy.aspx
22. Under no circumstances will HarperCollins be responsible for any loss, damages, costs or expenses arising from or in any way connected with any errors, defects, interruptions, malfunctions or delays in the promotion of the competition or prize.
23. HarperCollins will not be responsible unless required by law, for any loss, changes, costs or expenses, which may arise in connection with this competition and HarperCollins can cancel or alter the competition at any stage.
24. Any dispute relating to the competition shall be governed by the laws of England and Wales and will be subject to the exclusive jurisdiction of the English courts.