Postcode should be passed to the last form element to make sure it can be used to select the correct data catalog

# What's happening?
There is no post code that is being passed to the last form
# What should be happening?
The last form should get the postcode in order to look up the correct data catalog 
# How to reproduce?
1. 
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# Version
- SmartFlanders: V
- NodeJS: 8.13 LTS
