Now the deadline for entries has passed, I can copy here the text of a letter which will be in the Guardian tomorrow:
"I apologise to solvers who visited the web address hidden on the perimeter of last Saturday’s prize crossword only to find they had been redirected to the music video for a Rick Astley song. In fairness, last Saturday was the anniversary of the song’s release date, the solutions to 16D and 11D were RICK and ROLL, and the initial letters of the clues spelled “NEVER GONNA TELL A LIE AND HURT YOU”. I feel I gave ample warning."
It was fun to watch you all working on this - but I can't believe none of you spotted the acrostic :-)
Take care,
Hamish/Soup