Hi Jonah,
I saw your post just now, so sorry for the late reply.
If I understand you correctly, you want to hide the submenu items in the top menu.
You could just try the parameter [tt]&level=`1`[/tt] to restrict the output to only one level.
By the way: Wayfinder creates a pair of [tt]<ul>....</ul>[/tt] around the menuitems. So you must not put them around your Wayfinder call. (You have them twice.)
To let WF assign the [tt]id="nav"[/tt] to the [tt]ul[/tt] element, you have to indicate a modified [tt]&outerTpl[/tt] .
And validate your HTML code:
http://validator.w3.org/check?verbose=1&uri=http%3A%2F%2Fwww.yorkportraitstudio.co.uk%2Fprices%2F
Best wishes
ottogal