Help developing new professional mapping service for property professionals

*Only respond if you have experience in the UK property industry ideally in an architectural, land / property surveying or planning consultancy that uses large scale mapping on a regular basis. If you use existing services like Promap then even better. *

We're specifying the functionality for a new online mapping service for land and property professionals in the UK, including architectural, surveying or planning consultancies. We need input including:

-preferred pricing model
-ideal map scales and additional geographical datasets
-required formats (raster and vector)
-typical uses of large scale mapping
-identify typical pain points in your industry
-any other features / functionality that you can identify as being important

If you feel you can assist please submit a proposal. Feedback can be given by phone and email.