Hi Tony
You've updated to Lion 10.7.1 via Software Update??........check the version number using "About this Mac" under the "Apple" symbol in the top left hand corner
Also, as an even quicker trial...........could you repeat the Mac Sleep which causes the problem........but with the Mac originally connected via Ethernet to the HH.............i.e. with the Macbook connected before and ater sleep via Ethernet cable...........just a quick trial
That may point to something
Give it a try before the Sooloos COnfig.........which will take a while, given your starting point

If by chance that works..........when you open up your Macbook after sleep.......click on the Airport symbol in the top right hand corner.........select "Turn Airport Off"
Click the Symbol again......and select "Turn Airport On"