Can I force my iOS device to connect to 1 Wifi network over another

I don't know how I managed to miss this before, but it appears they are simply joined in alphabetical order

1. mywifinetwork
2. mywifinwk2

1 Will always be picked over 2

If you are able to persuade you're IT staff to change the name (SSID) of the network then you can do this

1. mywifinetwork
2. A_mywifinetwork

or

1. mywifinetwork02
2. mywifinetwork01

Should make sure 2 is always connected in preference to 1 when both are available

I've tested this a bit, but i'll come back and update if it stops working. So Far So Good Though.

If you can't get the SSID's changed then there is a much more complex solution here http://nootrix.com/2012/01/prioritize-wifi-on-iphone/

You can connect to the unwanted network, then go to "Settings -> WiFi", select that network and choose "Forget This Network". The device won't try to connect automatically to that network anymore, until you tell you to do so, choosing manually the WiFi network.

Also see this link.