When do you think Series 10 will premiere?

[Forever Secret]

I think it depends then what day of the week is classed as the beginning

Until the BBC confirm the date, I wouldn't trust anything you hear If the dates change up until the last minute for schedules then it could be next week we hear the air date
Could the info, about the 18th mean the Week Beginning rather than the actual day?

To be honest, I agree with you xzibit_m it wouldn't really be fair to put Spooks into a Sunday slot, even if it is the last Series, especially if they want to to go out on a high Outcasts was moved to a Sunday because of poor ratings, and because it was expected to do well, and it just didn't.
Spooks is already an a highly rated Drama, and already has a pretty big following... so perhaps if it is a Sunday the BBC are hoping the people who are already fans of the show will keep the ratings up... then again, it will never be able to compete with Downton Abbey that way, and I'm sure the BBC will want to win any kind of ratings war

It's either the 18th or 22nd, has to be, as the 9pm slot of taken on every other week day