Read data adjacent to Data Validation Source

[Hammer_757]

I’m trying to display the value from a cell next to a data validation source cell. I'm having trouble referring to named ranges while doing this.
On sheet “data Entry” I have dependant Data Validation selection cells “WDdetails” and “WallDetails” (both with green fill in the attached file). I want cell E10 (red fill) to display the value from the cell adjacent to the source of WallDetails.
The data comes from Sheet “Lists”

For example if I select:
“NOT weatherstriped NO storm” then
“W/D one side only”
I want to read .018 (from Lists:C2) in cell E10
It works if in E10 I use formula:

OFFSET(INDEX(ValData,MATCH(WallDetails,weatherstriped_OR_storm,0),MATCH(WDdetails,Lists!1:1,0)),,1)

However, because I need to expand this data to include more choices I need the array in the first MATCH, “

MATCH(WallDetails,weatherstriped_OR_storm,0)

” to be driven by WDdetails, not hard coded.
I've tried a lot to sort this out this weekend and am at the cry uncle point.
This is the closest I’ve come but it gives me a REF error:

INDEX(ValData,MATCH(WallDetails,INDIRECT(SUBSTITUTE(WDdetails," ","_")),0),MATCH(WDdetails,Lists!1:1,0))

Sorry for the crazy jargon but I’m trying to keep the terms in line with an old trade document.
Thanks
Robert