I have found the dates for this years Bike Week.
Britain Bike Week 2011 will take place 18th – 26th June nationwide.
The website is still a bit out of date, but you can send an email to firstname.lastname@example.org and they will let you know when it is up date.
Lets hope this year gets at least as good as last year.
LINK : http://www.bikeweek.org.uk/