Our agent chased up the CO a few days ago by way of an enquiry, and he's been given the following response:

Notes on file indicate that, as you advise, all documents requested have been recieved. This application is now undergoing checks which should be completed in approximately 6-8 weeks.

This has made us so mad! 8 weeks takes us to 9th May, and then how long will it take after that for the decision maker to decide our fate?

We were hoping to go early August, and I know that it could still happen, but at the moment we're really worried and confused as to what is going on.  We're in for a crap day now.

Once checks are completed the file will be allocated to a Decision Maker who will finalise this visa application."