Pertinent comment please -oh, sorry, this is the rumour network. Best fact I can find is at:
http://www.telegraph.co.uk/news/newstopics/politics/defence/8010686/RAF-Typhoon-jets-grounded-amid-safety-concerns.html
Good time to find the problem. If the only operational type were the Typhoon, and the snag was fundamental .... Maybe scrapping both the Tornado and the Harrier would be a bit risky?