I have been waiting for this chrome extension to come out and now its live.

PCA Predict a UK & international postcode or zip code lookup service have made a chrome extension that can be configured to work on Zoho CRM :) 

https://chrome.google.com/webstore/detail/pca-predict-real-time-add/ghoaecjajgjgmildhfkbckibpamokhgc?

Screen Shots of it dynamically adding address search by postcode below :)